Beyond the immediate cash flow crisis that the museum faces

Went with B but its a tough one.

Can someone help me understand how choice B is correct from parallelism point of view

B. whether it can broaden its membership and leave
It means - it can broaden and "it can leave"...

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 ------> if is used when there is a condition i.e if x then y
(B) whether it can broaden its membership and leave
(C) whether or not it has the capability to broaden its membership and can leave ------> mark this as rule, usage of whether or not in the same sentence is always wrong on GMAT
(D) its ability for broadening its membership and leaving ----> ability to is the correct idiom
(E) the ability for it to broaden its membership and leave ----> ability to is the correct idiom

I don't doubt on B - I also got to B. But I am asking for clarity on "and" and parallelism across and

Can someone help me understand how choice B is correct from parallelism point of view

B. whether it can broaden its membership and leave
It means - it can broaden and "it can leave"...

Just to be clear, though, "whether or not" is used all the time in regular English, and IS GRAMMATICALLY CORRECT. It is wrong on the GMAT (which is important to know!) because "or not" adds two more words that do not add any additional meaning.

simplyjat wrote: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

OA B

Always select whether over if..so A is out.C is unidiomatic..'whether or not'.

Jim@Grockit wrote:Just to be clear, though, "whether or not" is used all the time in regular English, and IS GRAMMATICALLY CORRECT. It is wrong on the GMAT (which is important to know!) because "or not" adds two more words that do not add any additional meaning.

Do we know this as a fact because on the OG answer it does not say that is incorrect? For answer choice C it only says adding it has the capability to creates an unnecessarily wordy construction. This phrase was placed right after "whether or not".

"if" is not permited but "weather" is permited to used to say "happen or not" . This is different from general grammar

capability of doing
is idiom
ability to do
is idiom
those 2 points are in general grammar

someone's ability to do
is idiom

ability for someone to do

is not idiom

pls, confirm/modify thank you