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Sentence Correction: Subject Verb Agreement - X of Y Subject

Some believe that the dictates of one's conscience needs to be followed even if they involve breaking the law. 

You're right!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the singular verb needs to the plural verb need, to match the plural subject dictates.

Incorrect.

This answer choice is grammatically incorrect.

The dictates of one's conscience is an X of Y subject. In such cases, the verb should agree with X (the dictates), which is plural. However, the verb needs is singular

[[snippet]]

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it is stylistically flawed. Adding the word people creates redundancy.

It is true that stylistic mistakes are not always corrected. However, since there is an answer choice that is both grammatically correct and stylistically superior to this answer choice, it is preferable.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, replacing be followed with follow distorts the meaning of the original sentence and creates an illogical sentence. The dictates of conscience do not follow anything - people follow them.

Incorrect.

This answer choice repeats the original mistake.

The dictates of one's conscience is an X of Y subject. In such cases, the verb should agree with X (the dictates), which is plural. However, the verb needs is singular

In addition, this answer choice is stylistically flawed. Adding the word people creates redundancy.

Some believe that the dictates of one's conscience needs to be followed
Some people believe that the dictates of one's conscience need to be followed
Some believe that the dictates of one's conscience need to follow
Some people believe that the dictates of one's conscience needs to be followed
Some believe that the dictates of one's conscience need to be followed