A key project team member is out on sick leave in the middle of a...

 The best course of action in this scenario is for the project manager to engage with the team to reprioritize tasks. This aligns with the PMP’s emphasis on the project manager’s role in leading and managing the project team. According to the PMBOK guide, the project manager should work with the team to assess the situation, reprioritize work, and apply resource optimization techniques to ensure that critical project milestones are met. This approach is proactive and focuses on problem-solving within the team’s capacity, rather than escalating the issue or sharing the challenges with stakeholders, which may not lead to a constructive solution.