According to the PMBOK Guide, 6th edition, section 4.5.3.1, the project manager is responsible for monitoring and controlling the project work and ensuring that the project is aligned with the business objectives and benefits. The project manager should also communicate the project performance and status to the relevant stakeholders and address any issues or concerns that arise from the project execution. In this scenario, the project manager should first review the established project benefits tracking metrics to assess the current state of the project and compare it with the expected outcomes and success criteria. This will help to identify any gaps or deviations and determine the appropriate actions to take. The other options are either premature or irrelevant, as they do not address the root cause of the problem or respect the authority and scope of the project manager. References: PMBOK Guide, 6th edition, section 4.5.3.1, page 122.