The conflict described is a communication issue within the team. According to the PMBOK Guide, one of the key roles of a project manager is to manage team dynamics and resolve conflicts. In this case, reviewing the ground rules for collaboration within the team can help remind team members of the expected behaviors and communication norms, which can help resolve the issue. Moving a team member to a different team (Option A) may not solve the underlying issue, reporting to supervisors (Option C) may escalate the situation unnecessarily, and modifying the communications management plan (Option D) may not directly address the interpersonal conflict. References: Project Management Body of Knowledge (PMBOK) Guide, 6th Edition, Section 9.5.2.1: Conflict Management