In conflict resolution, particularly in stakeholder disagreements, the project manager should act as a facilitator and mediator. Scheduling a joint meeting to promote open dialogue and reach mutual understanding supports collaborative decision-making and promotes transparency. The PMBOK Guide - Seventh Edition and PMI's Conflict Resolution guidance recommend collaborative problem-solving as the most effective approach in stakeholder conflict. Engaging both parties together helps to clarify misunderstandings and identify common ground. Option A is a last resort if resolution fails. Option B is useful for gathering information but delays the resolution. Option D lacks the project manager's facilitation and may not be constructive. References: PMBOK Guide - Seventh Edition, Stakeholder Engagement and Team Performance Domains PMBOK Guide - Sixth Edition, Section 9.5: Manage Team (Conflict Resolution Techniques) -