A project manager works in a startup company and is in charge of a key...

 According to the PMBOK Guide, when a team member fails to meet a commitment, the project manager should first seek to understand the reasons for the failure. This involves meeting with the team member to discuss the situation. The goal of this meeting is not to reprimand the team member, but to develop a plan to avoid similar situations in the future. This could involve additional training, adjusting the workload, or improving communication. The other options (A, B, C) might be appropriate in some situations, but they do not address the root cause of the problem and do not provide a proactive solution to prevent similar issues in the future. References: Project Management Body of Knowledge (PMBOK) Guide, 6th Edition, Section 9.5.2.1: Develop Team: Tools and Techniques.