A Simple CPM Network Has Three Activities,A,B,and C

Multiple Choice

A simple CPM network has three activities,A,B,and C.A is an immediate predecessor of B and of C.B is an immediate predecessor of C.The activity durations are A=4,B=3,C=8.

A) The critical path is A-B-C,duration 15.
B) The critical path is A-C,duration 12.
C) The critical path is A-B-C,duration 13.5
D) The critical path cannot be determined without knowing PERT expected activity times.
E) The network has no critical path.