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Sentence Correction: Pronoun Questions - Ambiguity

Most penguins feed on fish, squid, krill and other creatures of the sea since they are found chiefly in the ocean.

This answer choice is stylistically flawed. The pronoun they is ambiguous because it agrees with more than one noun. It is unclear to whom it refers - to penguins or to fish, squid, krill and other creatures of the sea.

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

Since there is an answer choice which corrects this mistake without creating a grammatical mistake or changing its meaning, it is preferable to this answer choice.

This answer choice repeats the original mistake. The pronoun they is ambiguous because it agrees with more than one noun. It is unclear to whom it refers - to penguins or to fish, squid, krill and other creatures of the sea.

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

Furthermore, this answer is redundant as a result of replacing the single word chiefly with the four-word phrase for the most part.

This answer choice is grammatically incorrect. The pronoun it can refer to a singular noun that appears before it, and there's no such noun in the sentence. All the previous nouns in the sentence are plural.

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

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

Excellent!

This answer choice is grammatically incorrect. The plural noun animals does not agree with the singular verb  is.

Furthermore, this answer choice does not correct the original ambiguity mistake. The phrase these animals is ambiguous because it agrees with more than one noun. It is unclear to whom it refers - to penguins or to fish, squid, krill and other creatures of the sea.

since they are found chiefly in the ocean
since for the most part they are found in the ocean
since it is found chiefly in the ocean
since the latter are found chiefly in the ocean
since these animals is found chiefly in the ocean