单选题：For the given directed weighted graph of 6 vertices, choose the

For the given directed weighted graph of 6 vertices, which one of the following sets of vertices satisfies that the earliest completion time of every member is equal to its latest completion time?






A.V1 V2 V6
B.V1 V2 V5
C.V1 V4 V6
D.V1 V5 V6


答案：C