问题：
[单选题] A line manager provides you with three estimates for his activity in your PERT network. His estimates are 2 weeks optimistically, 4 weeks mostlikely, and 12 weeks pessimistically. which would appear o
A、4 weeks
B、5 weeks
C、6 weeks
D、7 weeks
参考答案：
B、5 weeks
● 参考解析
