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Sentence Correction: Parts of Speech - Articles

The amount of paintings that can be displayed at a museum, as large as it may be, is, sadly, limited.

Very good!

This answer choice corrects the original Parts of Speech mistake, by changing amount to number. Only number can describe paintings (a count-noun). 

Note that the differences in wording between sadly, unfortunately, and regrettably, in the various answer choices are not significant at all in this question. The wording is different but the meaning is the same.  

While this answer choice corrects the original mistake, it creates another mistake by omitting the article a before the singular count noun museum.

The lesson to be learned here is not to declare an answer choice correct before eliminating all other four answer choices. After eliminating the two answer choices that repeat the original mistake (that is, (A) and (B)), you need to compare the remaining answer choices carefully and eliminate all but one of them.

Remember: we do not choose a correct answer choice - we eliminate four incorrect answer choices. Had you read both this answer choice and the last one, you would have seen that the only significant difference between them is the article a and would not have made the mistake you made.

The correct answer is (E).

While this answer choice corrects the original mistake, it creates another mistake by replacing the singular verb is with the plural verb are. This creates a Subject Verb Agreement mistake with the singular subject The number of paintings.

Two Stop Signs help us identify this mistake:

An X of Y subject

A long and complex subject / a long distance between the subject and the verb

The lesson to be learned here is not to jump at the first answer choice that corrects the original mistake. After eliminating the two answer choices that repeat the original mistake (that is, (A) and (B)), you need to compare the remaining answer choices carefully and eliminate all but one of them.

Remember: we do not choose a correct answer choice - we eliminate four incorrect answer choices. 

Incorrect.

This answer choice repeats the original mistake: the article the amount of can describe only non-count nouns whereas paintings is a count noun.

[[snippet]]

In addition, there is another grammatical mistake in this answer choice. The singular subject The amount of paintings does not agree with the plural verb are.

Two Stop Signs help us identify this mistake:

An X of Y subject

A long and complex subject / a long distance between the subject and the verb

Incorrect.

This answer choice is grammatically incorrect. The article the amount of can describe only non-count nouns whereas paintings is a count noun.

[[snippet]]
amount of paintings that can be displayed at a museum, as large as it may be, is, sadly,
amount of paintings that can be displayed at a museum, as large as it may be, are, unfortunately,
number of paintings that can be displayed at a museum, as large as it may be, are, sadly,
number of paintings that can be displayed at museum, as large as it may be, is, unfortunately
number of paintings that can be displayed at a museum, as large as it may be, is, regrettably,