The following PMP® exam sample question is taken from http://www.free-pm-exam-questions.com

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PMBOK Section:    Sequence Activities  
Process Group:    Planning  Process Group   
Question Type:    Calculation  
Knowledge Area:   Time Management   
Difficulty Level: Moderate

Question: "Activity / Duration / Predecessor

A / 2 / Start
B / 4 / A,E
C / 6 / A
D / 3 / B,C
E / 7 / Start
F / 2 / E

What is the critical path?"          

A. Start-A-B-D-End        
B. Start-E-F-End         
C. Start-A-C-D-End        
D. Start-E-B-D-End                    

Hint : Use PDM to calculate.       
Reference: PMBOK4 - pg:138                   

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The correct answer is D.
Explanation: The critical path of the data given is Start-E-B-D-End. Hence choice D is correct, while rest of the choices is incorrect.