Despite the Insights That PERT Provides,there Are Still Practical Limitations

Multiple Choice

Despite the insights that PERT provides,there are still practical limitations that impact its usefulness.All of the following difficulties are associated with the use of PERT EXCEPT: 

A)  It often requires more effort to generate three estimates than one. 
B)  It highlights uncertainty in project duration 
C)  It does not accurately address the case when two activities both need to be accomplished before a third can begin. 
D)  There is no assurance that three estimates are any more accurate than one