某地区为估计该地区梅花鹿的只数，先捕捉10只梅花鹿给它们做上标记，然后放还，待有标记的梅花鹿完全混合于鹿群后，第二次捕捉30只梅花鹿，发现其中5只有标记，从而估计这个地区有梅花鹿______只．

— What happened to the heroes in the in the end?

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

A. tried to

B. managed to

C. wanted to

D. did their best