The PMBOK Guide emphasizes the importance of a comprehensive change management plan that addresses all aspects of change within a project, including those not contractually specified. By ensuring that the change management plan reflects the requirement for the client's engineer to review all changes, the project manager can proactively address potential issues and align expectations with the client's needs. This approach is consistent with best practices in managing project changes and stakeholder engagement, as it helps in preventing misunderstandings and conflicts related to change approvals12. References: PMBOK Guide - Sixth Edition; "PMBOK Guide Change Management Process For PMP Exam" article by PM-by- PM1; "Change Control Board: Roles, Responsibilities & Processes" article by ProjectManager.com2.

The success of virtual teams largely depends on regular communication and the establishment of a strong sense of community among team members. Planning regular virtual meetings is a best practice for managing virtual project teams, as it helps to motivate and support the team, fosters collaboration, and keeps team members engaged1. This approach aligns with the principles of both Project Management and Business Analysis, which emphasize the importance of stakeholder engagement and team dynamics for project success2. References:
* Best practices for managing and developing virtual project teams1.
* Managing Virtual Teams for High Performance2.

According to the PMBOK Guide, 7th edition, one of the key activities of the project manager is to monitor and evaluate the project performance and outcomes, and to use the data and information collected to support decision making and adaptation. This is especially important for projects that operate in a dynamic and uncertain environment, where agility, market adaptation, and a quick response to market offerings are critical success factors. The project manager should conduct periodical reviews of the project plans, objectives, and deliverables to ensure that they are aligned with the changing needs and expectations of the stakeholders, and to identify and address any issues or risks that may affect the project value delivery. Option C is the best answer for this question.
Option A is not the best answer because reviewing the project objectives with the project sponsor is not a key activity that the project manager should undertake to ensure company success. It is a good practice to have a clear and shared understanding of the project objectives with the project sponsor, but it is not sufficient to ensure the project's agility, market adaptation, and responsiveness. The project manager should also engage other stakeholders, such as the customers, users, and team members, and review the project objectives with them as well.
Option B is not the best answer because requesting more funding from the project sponsor to hire additional skilled resources and to incorporate additional quality in the project delivery approach and outcome is not a key activity that the project manager should undertake to ensure company success. It is a possible action that the project manager may take if the project scope, schedule, or quality are affected by the changes in the market or the stakeholder needs, but it is not a proactive or adaptive activity that the project manager should perform regularly. Moreover, requesting more funding may not always be feasible or desirable, as it may increase the project costs and risks, and may not guarantee the project value delivery.
Option D is not the best answer because creating a business case after performing a market review, and then submitting it to the sponsor to modify the project deliverable to meet the newly defined objectives is not a key activity that the project manager should undertake to ensure company success. It is a possible activity that the project manager may perform if the project deliverable is no longer aligned with the business needs or the market opportunities, but it is not a frequent or iterative activity that the project manager should do to ensure the project's agility, market adaptation, and responsiveness. Moreover, creating a business case may not always be necessary or appropriate, as it may delay the project delivery and may not reflect the current or future state of the market or the stakeholder needs. References: PMBOK Guide, 7th edition, pages 9-10, 15-
16, 25-26, 35-36, 49-50.

When a project schedule risk becomes an issue, it is crucial for the project manager to actively engage with relevant stakeholders to explore and implement potential solutions. This collaborative approach ensures that the issue is understood from multiple perspectives and that the solutions are comprehensive and effective. It aligns with the PMI's principles of stakeholder engagement and proactive issue resolution12.
: The approach is supported by the PMI's guidelines on project risk and issue management, which recommend involving stakeholders in the resolution process to ensure that the project remains aligned with its objectives and can adapt to changes effectively12.

The best practice in project management, as per the PMP objectives, is to mitigate risks associated with resource availability by facilitating cross-functional knowledge transfer. This ensures that multiple team members are skilled in various components of the project, which allows for continuity of work in the event of an absence. The PMBOK Guide emphasizes the importance of knowledge transfer to enhance the team's ability to manage project risks and maintain productivity1.
: = Project Management Professional (PMP) Reference Materials, particularly the sections on risk management strategies1, and the Professional in Business Analysis (PMI-PBA) Reference Materials, which discuss the knowledge areas relevant to risk mitigation and resource management23.