According to the PMI Professional in Business Analysis objectives and content, one of the techniques to ensure consensus among stakeholders is to conduct a pre-review of the requirements with the key stakeholders before the formal review meeting. This can help to identify and resolve any issues, gaps, or conflicts that may arise during the meeting. A pre-review can also help to build trust and rapport with the stakeholders, and increase their confidence and commitment to the requirements. A pre-review can be done through interviews, workshops, surveys, or other methods of communication. References:
* PMI Professional in Business Analysis objectives and content: PMI-PBA Certification
* PMI Professional in Business Analysis reference list: PBA Reference List
* PMI Professional in Business Analysis study guide: Study.com

Communication is an essential part of requirements management, as it ensures that the requirements are clear, consistent, and agreed upon by all the project stakeholders. Stakeholders are the individuals or groups who have an interest or influence in the project, and who can provide input, feedback, and approval for the requirements. Communication also helps to avoid surprises, misunderstandings, and conflicts among the stakeholders, and to manage their expectations and satisfaction. Communication should be timely, accurate, relevant, and transparent, and should follow the communication plan and strategy defined in the requirements management plan12.
One of the aspects of communication is the status of the requirements, which indicates the progress and completion of the requirements throughout the project life cycle. The status of the requirements can be tracked and documented using a traceability matrix, which is a tool that links the requirements to their sources and traces them throughout the project. The status of the requirements can also be monitored and controlled using a change control process, which is a process that evaluates, approves, and implements any changes to the requirements. The status of the requirements can have different values, such as proposed, approved, implemented, verified, deferred, deleted, or rejected12.
When the status of a requirement changes, it should be communicated to all the project stakeholders, not just the source of the requirement or the project team. This is because the change in the status of a requirement may have an impact on the scope, schedule, cost, quality, or risk of the project, and may affect the interests or expectations of the stakeholders. Communicating the status of the requirements to all the project stakeholders helps to keep them informed and engaged, and to obtain their feedback and approval. It also helps to prevent surprises, such as the one experienced by the major stakeholder in the question, who was unaware that a particular requirement was deferred12.
Therefore, the best option is C. The status should have been communicated to all project stakeholders. Option A is not the best option, because the status should have been communicated to more than just the requirement' s source. Option B is not the best option, because the status should have been communicated earlier than prior to project launch. Option D is not the best option, because updating the status in the traceability matrix is not enough, as the stakeholders may not have access to or awareness of the matrix. References: 1 PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline, page 9-11; 2 Requirements Management 101 | Smartsheet 2

Requirements are statements of the needs, expectations, or conditions that must be met by a solution.
Requirements should be clear, complete, consistent, and testable, so that they can be understood, verified, and validated by the stakeholders. If the requirements are not ready for peer review, it means that they have not met these quality criteria, and that they need to be refined or revised. One possible cause of this situation is that the requirements do not provide all of the information needed to define the work, such as the scope, objectives, deliverables, assumptions, constraints, risks, dependencies, etc. This would make it difficult for the peer reviewers to evaluate the feasibility, accuracy, and alignment of the requirements with the business needs and goals. The other options are not likely to cause this problem. Some requirements having not yet been discussed in a work group session is not a reason to delay the peer review, as long as the requirements have been elicited from the relevant sources and documented properly. The requirements' reference codes not tracing to the attribute numbers in the work breakdown structure is a minor issue that can be easily fixed by updating the reference codes or the work breakdown structure. The requirements documents having not yet received sign-off from the sponsor is not a prerequisite for peer review, as sign-off is usually obtained after the peer review and validation process. References: PMI-PBAExamination Content Outline, page 13; PMI- PBA Reference List, page 1, BABOK Guide v3, page 39.

A user survey is a technique that can be used to determine how well the solution meets the business case. A user survey is a method of collecting feedback from the end users of the solution about their satisfaction, preferences, expectations, needs, problems, or suggestions. A user survey can help to measure the performance, quality, usability, and value of the solution and compare it with the expected benefits and outcomes defined in the business case. A user survey can also help to identify areas for improvement or enhancement of the solution. Asking the sponsor for feedback is not sufficient to determine how well the solution meets the business case, as it does not capture the perspective of the end users who are directly affected by the solution. Surveying the project is not relevant to this scenario, as it does not focus on the solution but rather on the project management processes and practices. Comparing the results of day-in-the- life (DITL) testing and integration testing is not effective, as it does not reflect the actual usage and experience of the solution by the end users after deployment. References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline1, page 14; Business Analysis for Practitioners: A Practice Guide2, page 80.

The business case provides the rationale for the project and includes an analysis of the costs and benefits. It is used to assess risks, including the potential need to cancel the product. References: PMI-PBAExamination Content Outline, Business Analysis for Practitioners: A Practice Guide.