The correct answer is D. According to the PMBOK Guide, the project manager should manage stakeholder expectations and engagement by applying appropriate tools and techniques, such as stakeholder analysis, communication management, conflict resolution, and negotiation1. The project manager should also use the project charter as a reference document to clarify the project objectives, scope, and deliverables2. By breaking down the situation and identifying the root causes for the disagreement, the project manager can address the underlying issues and concerns of each stakeholder and align them with the project vision and goals. The project manager can then work with each stakeholder and participating entity on their exact roles and responsibilities, and ensure that they are committed and supportive of the project. References: 1: PMBOK Guide, page 513-514; 2: PMBOK Guide, page 77-78