Explanation
According to the PMBOK Guide 6th Edition, the project manager should act as a servant leader in an agile environment, which means supporting the team members in their self-organization, collaboration, and continuous improvement. The project manager should also facilitate the alignment of the team's goals with the project vision and objectives. Therefore, the best option is to encourage the whole team to be empowered and accountable for the decisions made according to their roles, such as defining and prioritizing the backlog items, delivering the increments, and meeting the acceptance criteria. Extending the sprints, requesting the team to complete the technical debt, or reviewing the OPAs are possible actions that the project manager can take later, but they are not the best option to resolve the situation in their new role as servant leader. References: PMBOK Guide 6th Ed., 3.0 The Role of the Project Manager, Page 51; PMBOK Guide 6th Ed., 3.1.2 Project Manager's Sphere of Influence, Page 53; PMBOK Guide 6th Ed., 3.1.3 Project Manager's Competencies, Page 54; 1