I'm afraid he's more of a talker than a doer,which is _____ her never finis
I'm afraid he's more of a talker than a doer,which is _____ her never finishes anything.[     ]A.that
B.when
C.where
D.why
 
 
为什么不选A   what可以吗  而且如果为定语从句 不应该是the reason why