Explanation
Increasing variances during the execution phase imply that the uncertainty and risk are increasing, as the project performance is deviating from the planned values.
According to the PMBOK Guide - Sixth Edition1, variance analysis is a technique used to compare the actual performance of the project against the planned or expected performance. It can be applied to various aspects of the project, such as scope, schedule, cost, quality, and risk. Variance analysis can help identify deviations from the baseline and determine the causes and impacts of those deviations. If the variances are shown as increasing, it means that the actual performance is deviating more and more from the planned performance, which implies that the uncertainty and risk are increasing. This could affect the project objectives and deliverables, and require corrective or preventive actions to bring the project back on track. The other options are not correct, as they are either too specific (B and D) or contradictory to the result of the variance analysis. References: PMBOK Guide - Sixth Edition, pages 262-263.

Explanation
The project manager should have performed an analysis to ensure that the change request was valid and well-supported before submitting it to the sponsor. This would help in making a strong case for the change request and increase the chances of its approval.
The project manager should have performed an analysis to affirm the request is valid before submitting, as this would help to justify the need for the change and to demonstrate its impact on the project objectives, scope, schedule, cost, quality, and risk. The project manager should also have consulted with the project team, the subcontractor, and the risk owner to determine the best risk response strategy and to estimate the resources and time required for the change. By performing an analysis, the project manager could have increased the chances of getting the change request approved by the sponsor and avoided wasting time and effort on an invalid request. References: The Standard for Risk Management in Portfolios, Programs, and Projects, page 79; PMBOK Guide, 6th edition, page 115.

Explanation
The project manager should have performed risk identification exercises for the full lifecycle of the project, including the construction phase, to ensure that all potential risks were identified and addressed in the risk register.
Risk identification is the process of determining the risks that may affect the project and documenting their characteristics. Risk identification should be performed throughout the project lifecycle, as new risks may emerge or change over time. Risk identification should also consider all aspects of the project, such as scope, schedule, cost, quality, resources, stakeholders, and procurement. By performing risk identification exercises for the full lifecycle of the project, the project manager could have identified and planned for the potential risks associated with the construction phase, such as delays, material shortages, quality issues, or safety hazards. This would have helped to prevent or mitigate the impact of the risk event that occurred, and to ensure that the risk register is updated and comprehensive. Performing a Monte Carlo sensitivity analysis, adding generic construction risks, or reviewing the assumptions/exclusions register are not sufficient or effective ways of identifying the specific risks that may affect the project during the construction phase. These are either tools for risk analysis, risk response planning, or project initiation, but not risk identification.
References: PMI-RMP Certification Handbook1, page 9; PMBOK Guide, pages 397-398.

Explanation
To ensure an effective risk management plan, the risk manager needs to consider aligning the plan to project constraints and priorities and obtaining stakeholder acceptance, as these factors will help ensure that the plan is relevant and supported by the project team and stakeholders.
According to the PMI-RMP Handbook, the risk management plan is a document that describes how risk management activities will be structured and performed on the project. It is one of the main outputs of the Plan Risk Management process. The risk management plan should consider the following factors to ensure its effectiveness:
Aligning to project constraints and priorities: The risk management plan should be aligned with the project objectives, scope, schedule, cost, quality, resources, and stakeholder expectations. It should also reflect the project's risk appetite, tolerance, and threshold levels, which indicate the degree of uncertainty that the project can accept. The risk management plan should prioritize the risk management activities based on the project's critical success factors and key performance indicators.
Obtaining stakeholder acceptance: The risk management plan should be developed with the involvement and input of key stakeholders, such as the project sponsor, customer, team members, subject matter experts, and other relevant parties. The risk management plan should be communicated and approved by the stakeholders to ensure their commitment and support for the risk management process. The risk management plan should also define the roles and responsibilities of the stakeholders in risk management, as well as the reporting and escalation mechanisms.
The other options are not valid factors for ensuring an effective risk management plan:
Applying modern risk management techniques: The risk management plan should apply the appropriate risk management techniques that suit the project's context, complexity, and characteristics.
The techniques should be based on the best practices and standards of the profession, such as the PMBOK Guide and the Practice Standard for Project Risk Management. The techniques do not have to be modern or innovative, as long as they are effective and efficient.
Ensuring risk response strategies mitigate all risks: The risk management plan should define the risk response strategies that will be used to address the identified risks. However, the risk response strategies do not have to mitigate all risks, as some risks may be accepted, transferred, or avoided. The risk response strategies should be based on the risk analysis and evaluation, which consider the probability and impact of the risks, as well as the cost and benefits of the responses.
Minimizing implementation costs: The risk management plan should consider the budget and resources available for the risk management activities. However, the risk management plan should not aim to minimize the implementation costs at the expense of the quality and effectiveness of the risk management process. The risk management plan should balance the costs and benefits of the risk management activities, and ensure that they provide value to the project.
References: PMI-RMP Handbook1, PMBOK Guide2, Practice Standard for Project Risk Management2

Explanation
The project manager should assess and record associated secondary risks and proceed to treat them as any other risks. This involves identifying and evaluating the potential negative health effects of using pesticides and developing a plan to mitigate these risks. While it is important to consider the concerns of residents, the health authorities have determined that not moving forward with the plan will have more serious consequences on public health.
Secondary risks are those that arise as a direct outcome of implementing a risk response. In this case, the use of pesticides is a risk response to limit the risks of harmful insects, but it may also cause negative health effects to some residents. This is a secondary risk that needs to be assessed and recorded in the risk register, along with its probability, impact, and response plan. The project manager should not suspend the project, as this would ignore the primary risk of harmful insects. The project manager should not consult with health experts to provide a risk trigger, as this is not a valid risk management technique. A risk trigger is an indication that a risk event is about to occur or has occurred, not a condition that prevents a risk response from being implemented. The project manager should not proceed with the project as normal, as this would neglect the secondary risk and its potential consequences. The project manager should follow the risk management process and treat the secondary risk as any other risk in the project. References: PMI. (2017). A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition. Chapter 11: Project Risk Management, p. 408. 5