OG12 SC-34 whether的问题

leonnong

Beyond the immediate cash flow crisis that the
museum faces, its survival depends on if it can
broaden its membership and leave its cramped
quarters for a site where it can store and exhibit its
more than 12,000 artifacts.

(A)if it can broaden its membership and leave

(B)whether it can broaden its membership
and leave

(C）whether or not it has the capability to broaden
its membership and can leave

(D)its ability for broadening its membership
and leaving

(E)the ability for it to broaden its membership
and leave

问题是:whether和whether or not等同吗？如果等同，是不是whether or not没有单独用whether好呢？（我明白B中has the capapbility to的表述太wordy了）

mongmong

补充：在引导主语从句时，只用whether
来源：http://forum.chasedream.com/GMAT_SC/thread-598739-1-1.html

枫腾惠子

在宾语从句中只用whether
在状语从句中 就是要用 whether or not