— What happened to the heroes at the end of the book?

— All of them _____ escape from the enemy's prison and began their new life. [ ]

A. tried to          

B. managed to          

C. wanted to          

D. did their best

（）是一门有理论、有方法及有系统地研究人类行为管理活动中各种现象与基本规则的一门结合自然科学与社会科学的综合性学科。

A.管理学

B.社会学

C.人类学

D.公共安全管理学