New PMP Question & Answers with explanation

A project manager is developing a project charter, but a key stakeholder is failing to provide information about the expected project benefits. What should the project manager do?
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At the end of an iteration, a team member tells the project manager that a planned task is unfinished because of an issue that appeared days ago but was unable to be resolved. What should the project manager do to prevent this type of situation in the future?
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A project manager for a software development project has collected the work performance data and used the requirements documentation and requirements traceability matrix to generate the work performance information regarding variances in the project work compared to the baseline. What process is the project manager performing?

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In a pharmaceutical project, human trials are to start soon. The CEO is thrilled about the success of the trials up to this point. She announces that the size of the patient pool for the trials should double from the one originally planned and results tracked in the new system launching this week. What should the project manager do first?
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The agile project team members are all working in an open office space arrangement. There are many conversations happening concurrently throughout the day. Which of the following is the best option for the project manager?
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