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Sentence Correction: Pronoun Questions - Overview and Grammatical Mistake

Office politics are time and effort consuming, but it is an inevitable part of most jobs. 

Incorrect.

This answer choice is grammatically incorrect. The singular subject politics does not agree with the plural verb are.

You're right!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb are to the singular verb is, to match the singular subject politics

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistakes and is grammatically correct, it changes the meaning of the original sentence by replacing most with many.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistakes, it doesn't fit into the original sentence. The original sentence does not end where the answer choice ends - it continues with the word jobs.  

This answer choice repeats the original mistake. The singular subject politics does not agree with the plural verb are.

[[snippet]]

In addition, this answer choice creates a Pronoun agreement mistake. The pronoun they does not agree with the singular noun politics to which it refers.

are time and effort consuming, but it is an inevitable part of most
is time and effort consuming, but it is an inevitable part of most
are time and effort consuming, but they are an inevitable part of most
is time and effort consuming, but it is inevitable
is time and effort consuming, but it is an inevitable part of many