Explanation
According to the PMBOK Guide, the project manager should use appropriate conflict resolution techniques to minimize the negative effects of conflict and enhance project performance. The project manager should also consider the emotional and interpersonal aspects of conflict and facilitate constructive dialogue between the parties involved. Sending both team members to the HR department (option A) may not be the best solution, as it may imply that the project manager is unable to handle the conflict and may damage the trust and morale of the team. Understanding each team member's argument and selecting the one that results in less risk to the project (option B) may also be problematic, as it may create a win-lose situation and increase the resentment and frustration of the losing party. Offering a compromise that is acceptable to both team members, even if it may not be the best solution (option D) may also be suboptimal, as it may result in a lose-lose situation and reduce the quality and effectiveness of the project outcome. Helping the team members to resolve the conflict in a way that results in the best team performance (option C) is the most desirable option, as it may lead to a win-win situation and foster collaboration and innovation among the team members. References: : Project Management Institute. (2017). A Guide to the Project Management Body of Knowledge (PMBOK Guide) (6th ed.). Newtown Square, PA: Author.