Which of the Following Is Not a Fundamental, Inherent Weakness

Multiple Choice

Which of the following is not a fundamental, inherent weakness in the probabilistic approach to PERT?

A) One may have difficulty in obtaining three reliable time estimates for each activity.
B) There is the possibility of large variances for non-critical activities.
C) The assumption that activity times are independent of each other.
D) The assumption that possible overall project completion times are Beta-distributed.