An audit meeting is a systematic, independent, and documented process for obtaining evidence and evaluating it objectively to determine the extent to which the risk management process criteria are fulfilled. It helps in assessing the effectiveness of the risk management practices and identifying areas for improvement. Regular audit meetings are essential for ensuring that the risk management process remains robust and can adapt to changes within the project12.
References:
Risk Management Process for PMP - Project Management Academy1.
Risk Audit vs Risk Review - Project Management Academy2.

A retrospective review is a meeting held at the end of an iteration in Agile project management, where the team can assess past work and plan future project goals1. One of the benefits of retrospective reviews is that they foster continuous improvement by identifying what went well and what can be improved2.
If the project team members are not completing tasks during the iterations because of interruptions and requests for help from other teams, it indicates that there is a problem with the team's collaboration and communication. The project manager, as a team facilitator, should address this problem by identifying its root causes and defining the ground rules with all project team members to minimize interferences. This way, the project manager can help the team to focus on their tasks, avoid distractions, and respect each other's time and boundaries3.
The other options are not correct for the following reasons:
* B. Recommend to the project team members that they should improve their planning and make their stories smaller. This option does not address the problem of interruptions and requests for help from other teams, which are external factors that affect the team's performance. Making the stories smaller may help the team to deliver faster and more frequently, but it does not solve the underlying issue of poor collaboration and communication.
* C. Reunite with the project team members affected and tell them not to reduce the team's capacity. This option is not effective because it does not address the problem's root causes, nor does it involve the whole team in finding a solution. Telling the team members not to reduce their capacity may also be perceived as blaming or pressuring them, which can lower their morale and motivation.
* D. Hire a coach to help all project teams to improve their abilities to solve problems on their own. This option is not feasible because it involves hiring an external resource, which may not be available or affordable. Moreover, hiring a coach does not guarantee that the problem will be solved, as the coach may not have the same context or understanding of the project as the team members.
1: Agile Retrospective Guide: What Is It & How To Run It 2: Sprint Retrospective: How to Hold an Effective Meeting - Atlassian 3: End of the project: how to run your final retrospective

According to the PMBOK Guide, the stakeholder register is an output of the Identify Stakeholders process, and it contains information about the project stakeholders, such as their identification, assessment, classification, and engagement levels1. The communications management plan is an output of the Plan Communications Management process, and it describes how the project information will be managed and communicated among the stakeholders, such as the communication requirements, methods, formats, frequency, roles, and responsibilities2. Whenever there is a change in the project team or the stakeholder environment, the project manager should update the stakeholder register and the communications management plan accordingly, to ensure that the new team member or stakeholder is properly identified, analyzed, and engaged3. In this case, the project manager should include the new team member in the stakeholder register and update the communications management plan to reflect the team member's communication preferences, such as working remotely and being more responsive in face-to-face interactions. This will help the project manager to plan and manage the project communications more effectively and efficiently, and to avoid potential misunderstandings, conflicts, or delays45. References: 1:
PMBOK Guide, 7th edition, page 215 2: PMBOK Guide, 7th edition, page 237 3: PMBOK Guide, 7th edition, page 217 4: Project Team Communications4 5: How to create a project management communication plan5

The project manager should check with the agile teams to see if their understanding of the Agile Manifesto is correct because the Agile Manifesto values working software over comprehensive documentation. This means that agile teams should produce only the essential documentation that adds value to the project and the customer, and avoid unnecessary or excessive documentation that may slow down the delivery process or become outdated. The project manager should respect the agile teams' autonomy and self-organization, and not impose any documentation requirements that are not aligned with the agile principles and practices. The project manager should also collaborate with the agile teams to understand their documentation needs and preferences, and support them in creating and maintaining the appropriate documentation for the project. References:
* PMBOKGuide, 6th edition, page 25, section 1.2.4
* PMI-PBA Guide, 1st edition, page 14, section 1.3.3
* [Agile Manifesto]
* PMP Questions page 494, question 494
* Free PMP Practice Exam Questions, question 2
* PMP Project Management Professional Exam Study Guide, page 494, section 9.1