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Sentence Correction: Pronoun Questions - One

It is a common belief that if one wants to succeed, they need to be not only intelligent but also ambitious.

Incorrect.

This answer choice is grammatically incorrect: the pronoun they refers to one but does not agree with it as one is singular and they is plural.

[[snippet]]

Incorrect.

This answer choice repeats the original Pronoun mistake: the pronoun they refers to one but does not agree with it as one is singular and they is plural.

[[snippet]]

In addition, this answer choice creates a Subject Verb Agreement mistake: the singular subject one does not agree with  the plural subject want.

Incorrect.

Although this answer choice corrects the original Pronoun mistake, it creates a Subject Verb Agreement mistake: the singular subject one does not agree with  the plural subject want.

Incorrect.

This answer choice repeats the original Pronoun mistake: the pronoun they refers to one but does not agree with it as one is singular and they is plural.

[[snippet]]

Note that this answer choice is stylistically better than both the original sentence and the correct answer choice (hint!) as it uses the more concise both intelligent and ambitious instead of the longer original not only intelligent but also ambitious. However, grammatical correctness comes first. The correct answer choice can be redundant or otherwise stylistically flawed, but it can NEVER be grammatically incorrect.

Good job!

This answer choice corrects the original Pronoun mistake by changing the plural pronoun they to the singular pronoun one, which agrees with the subject one to which it refers (if one wants to succeed...)

wants to succeed, they need to be not only intelligent but also
want to succeed, they need to be not only intelligent but also
want to succeed, one needs to be not only intelligent but also
wants to succeed, they need to be both intelligent and
wants to succeed, one needs to be not only intelligent but also