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Sentence Correction: Pronoun Questions - One

When investigating an incident from the distant past, it is a common occurrence that there is partially or completely conflicting accounts of the same event and, therefore, to construct a realistic historical hypothesis, one should collate as many records as one can.

Incorrect.

This answer choice is grammatically incorrect. The plural subject conflicting accounts does not agree with the singular verb is. Once the verb is located, it is important to ask what the subject of that verb is.

What helps us identify this question as a Subject Verb Agreement question and identify the mistake is the following Stop Sign

The verb precedes the subject  

Incorrect.

This answer choice is grammatically incorrect and repeats the original Subject Verb Agreement error. The plural subject conflicting accounts does not agree with the singular verb is

What helps us identify this question as a Subject Verb Agreement question and identify the mistake is the following Stop Sign

The verb precedes the subject  

Incorrect.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural verb are with the plural subject conflicting accounts, it is grammatically incorrect. The pronouns he can refer to human male nouns, but there's no such noun in the sentence.

The pronoun one agrees with itself only.

Example: One must be careful with what one wishes for.

[[snippet]]

Incorrect.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural verb are with the plural subject conflicting accounts, it is grammatically incorrect. The pronoun they refers to one but does not agree with it as one is singular and they is plural.

The pronoun one agrees with itself only.

Example: One must be careful with what one wishes for.

[[snippet]]

Impressive work!

This answer choice corrects the original Subject Verb Agreement error by matching the plural verb are with the plural subject conflicting accounts.

When investigating an incident from the distant past, it is a common occurrence that there is partially or completely conflicting accounts of the same event and, therefore, to construct a realistic historical hypothesis, one should collate as many records as one can
To construct a realistic historical hypothesis, one should collate as many records as one can because when investigating an incident from the distant past, it is a common occurrence that there are partially or completely conflicting accounts of the same event
When investigating an incident from the distant past, it is a common occurrence that there are partially or completely conflicting accounts of the same event, and to construct a realistic historical hypothesis, one should therefore collate as many records as he can
When investigating an incident from the distant past, a common occurrence is that there are partially or completely conflicting accounts of the same event, so one should collate as many records as they can in order to construct a realistic historical hypothesis
To construct a realistic historical hypothesis, one should collate as many records as one can because when investigating an incident from the distant past, it commonly occurs that there is partially or completely conflicting accounts of the same event