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1.       Art museums do not usually think of their collections as capital or consider the interest income that would be generated if a portion of the capital would have been invested in another form.

(A) be generated if a portion of the capital would have been

(B) have been generated if a portion of the capital would have been

(C) be generated if a portion of the capital were

(D) be generated if a portion of the capital was（C）

(E) be generated if a portion of the capital had been

i chose D,but the correct answer is C, why use "were", is "capital" plural.

could someone help me on this. thank you a lot!

I agree with C , since I looked it up in the longman dictionary.

Capital:

▶MONEY◀
[singular, uncountable] money or property, especially when it is used to start a business or to produce more wealth
The government is eager to attract foreign capital.
ￚsee also working capital, venture capital

Besides,

Portion

[usually singular] a share of something, such as responsibility, blame, or a duty, that is divided between a small number of people
portion of
The other driver must bear a portion of the blame for the accident.

Don't trust the answer sheet, there are a lot of mistakes in it.

Trust yourself and dictionaries