为自己加油

I think this makes a man out of a boy sooner than almost anythifig else.

A.It will take a shorter time for a mature man to do this than a boy.
B.It will turn a boy into a mature man in a shorter time.
C.It will make a mature man feel younger like a boy in a shorter time.
D.It will leave a boy far behind a mature man in a shorter time.