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Sentence Correction: Pronoun Questions - Ambiguity

Mark's adopting parents thanked the employees of the adoption agency for realizing their dream of becoming parents.

Incorrect.

This answer choice repeats the original mistake. The pronoun their is ambiguous because it agrees with both Mark's adopting parents and employees

[[snippet]]

This answer choice is also redundant and doesn't fit as a result of replacing the single word realizing with the three-word phrase making...come true. The complete sentence now reads: ...come true of becoming parents - an ungrammatical construction.

Incorrect.

This answer choice is illogical. The pronoun his agrees with Mark whereas the dream of becoming parent's is not Mark's.  

Excellent!

This answer choice corrects the original ambiguity mistake in a clever way. It retains the originally ambiguous pronoun their, but changes one of the plural nouns with which it agreed (employees) to the singular staff. The result is that their now agrees with one noun only - Mark's adopting parents, so it is no longer ambiguous.

Incorrect.

This answer choice repeats the original mistake. The pronoun their is ambiguous because it agrees with both Mark's adopting parents and employees

[[snippet]]

Incorrect.

This answer choice is stylistically flawed. The pronoun their is ambiguous because it agrees with both Mark's adopting parents and employees

[[snippet]]
employees of the adoption agency for realizing their dream
employees at the adoption agency for realizing their dream
adoption agency staff for realizing their dream
employees of the adoption agency for realizing his dream
employees of the adoption agency for making their dream come true