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Sentence Correction: Pronoun Questions - Ambiguity

New York City is the largest city in the USA although Washington, D.C. is its capital. 

This answer choice is stylistically flawed. The pronoun its is ambiguous since it agrees with both New York City and the USA.

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. The pronoun its is ambiguous since it agrees with both New York City and the USA.

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

Note that replacing although with but does not change the meaning of the original sentence because although and but have the same meaning.

Good!

This answer choice repeats the original mistake. The pronoun its is ambiguous since it agrees with both New York City and the USA.

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

Note that despite repeating the original mistake, this answer choice is nevertheless better than the original sentence because it is more concise. It expresses the same meaning in fewer words as a result of replacing the six-word phrase the largest city in the USA with the four-word phrase the USA's largest city.

Although this answer choice corrects the original ambiguity mistake, it changes the meaning of the original sentence by replacing the opposition word but with the addition word and.

is the largest city in the USA although Washington, D.C. is its
is the largest city in the USA, but Washington, D.C. is its
is the largest city in the USA although Washington, D.C. is the USA's
is the USA's largest city although Washington, D.C. is its
is the largest city in the USA, and Washington, D.C. is the USA's