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Sentence Correction: Pronoun Questions - Ambiguity

Churchgoers in the Oldcastle parish have asked the leaders of the Human Genome Project not to hold a convention in the center opposite the local church since the agenda presented in the convention may be offensive to them.

This answer choice is stylistically flawed. The pronoun them is ambiguous because it agrees with both churchgoers and leaders

What helps us identify this question as a Pronoun question as well as identify the ambiguity mistake is the following Stop Sign:

Every pronoun in the underlined part of the sentence or after it

This answer choice repeats the original mistake. This answer choice is stylistically flawed. The pronoun them is ambiguous because it agrees with both churchgoers and leaders

What helps us identify this question as a Pronoun question as well as identify the ambiguity mistake is the following Stop Sign:

Every pronoun in the underlined part of the sentence or after it

In addition, the omission of the words the center opposite changes the meaning of the original sentence. 

This answer choice repeats the original mistake. This answer choice is stylistically flawed. The pronoun them is ambiguous because it agrees with both churchgoers and leaders

What helps us identify this question as a Pronoun question as well as identify the ambiguity mistake is the following Stop Sign:

Every pronoun in the underlined part of the sentence or after it

In addition, replacing the single word since with the five-word phrase due to the fact that creates redundancy.

Almost... This answer choice corrects the original ambiguity mistake in a clever way. It retains the originally ambiguous pronoun them, and changes one of the plural nouns with which it agreed (leaders) to the singular leadership. The result is that them now agrees with one noun only - Churchgoers, so it is no longer ambiguous.

Had this been the only difference between the original sentence and this answer choice, it would have been the correct answer. However, this answer also makes another change which makes it stylistically flawed. Replacing the single word since with the five-word phrase due to the fact that creates redundancy.

Excellent! This answer choice corrects the original ambiguity mistake in a clever way. It retains the originally ambiguous pronoun them, but changes one of the plural nouns with which it agreed (leaders) to the singular leadership. The result is that them now agrees with one noun only - Churchgoers, so it is no longer ambiguous.

the leaders of the Human Genome Project not to hold a convention in the center opposite the local church since the agenda presented in the convention may be offensive to them
the leaders of the Human Genome Project not to hold a convention at the local church since the agenda presented in the convention may be offensive to them
the leaders of the Human Genome Project not to hold a convention in the center opposite the local church due to the fact that the agenda presented in the convention may be offensive to them.
the leadership of the Human Genome Project not to hold a convention in the center opposite the local church due to the fact the agenda presented in the convention may be offensive to them
the leadership of the Human Genome Project not to hold a convention in the center opposite the local church since the agenda presented in the convention may be offensive to them