Our school was moved to Gaoxin District in 2005, and the new campus is ________ the old one.

A．three times as large as

B．more larger three times than

C．three times larger than that of

D．three times as the size of

某网络工程项目完成估计需要12个月。在进一步分析后认为最少将花8个月，最糟糕的情况下将花28个月。那么，这个估计的PERT值是（）个月。

A．9

B．11

C．13

D．14