Explanation
The project manager should use the retrospective meeting to better understand the root cause of the quality problems and put together a plan with the team to address the problems. This is the best way to apply the agile principle of inspecting and adapting the process and the product continuously. The retrospective meeting is a regular opportunity for the team to reflect on their performance, identify the strengths and weaknesses, and generate improvement actions. The project manager should facilitate the meeting and ensure that the team members are engaged, honest, and collaborative. The other options are not the best actions to take in this situation, as they do not follow the agile values of customer collaboration, team empowerment, and responding to change. References: = A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 7: Project Delivery, Section 7.3: Deliver Iteration, Page 197-198.