The prisoner ________escape from the prison, but failed. [     ]

A. attempted to                  

B. managed to

C. was able to                  

D. succeeded in

根据下表描述，回答问题1、问题2、问题3和问题4，将解答填入对应栏内。
【说明】
设贴现率为12%，金额单位为万元，建设期净现金流量为年初投资额，运营期净现金流量为年末净现金流入量。