The following PMP® exam sample question is taken from the Free PMP Exam Simulator at http://free.pm-exam-simulator.com - The answer is at the very bottom:

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Your sponsor asked you to quickly complete all your project planning processes and start the project by next week. One week later you were working on your Communications Management Plan when your sponsor asked for a project update. He was unhappy to hear that you were still working on project planning. What reasons should you give your sponsor in support of communications management planning?

A.) A Communications Management Plan is mandatory on a project.
B.) A Communications Management Plan will reduce conflicts.
C.) A Communications Management Plan will reduce project risk.
D.) A Communications Management Plan will reduce project time.

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Hint: All of the choices are correct but there is a best answer that you must give to your sponsor.
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ANSWER AND EXPLANATION:
The correct answer is B
Explanation: All of the choices are correct. However, only choice B is the best. The best thing you can tell your sponsor is that since a Communications Management Plan will set project communication rules and requirements it will help to control and reduce stakeholder conflicts.
Reference: PMBOK Guide 4th Edition, page 252