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Sentence Correction: Pronoun Questions - Ambiguity

After 12 hours, hostage negotiators finally resolved a situation involving three bank robbers and 35 hostages; their efforts were rewarded generously by the grateful bank management.     

This answer choice is stylistically flawed. The pronoun their is ambiguous as it agrees with more than one previously mentioned noun.

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 their is ambiguous as it agrees with more than one previously mentioned noun.

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 involving with the two-word phrase which involved creates redundancy.

Very good!

This answer choice corrects the original ambiguity mistake. However, replacing the single word involving with the two-word clause that involved creates redundancy. Since there is an answer choice that corrects the ambiguity mistake without creating another mistake, it is preferable to this one.

This answer choice is illogical. While the pronoun their agrees with hostages grammatically, replacing their with hostages creates an illogical sentence because the efforts were not the hostages', and it's not the hostages whose efforts were rewarded.

involving three bank robbers and 35 hostages; their
involving three bank robbers and 35 hostages; the hostages'
which involved three bank robbers and 35 hostages; their
that involved three bank robbers and 35 hostages; the negotiators'
involving three bank robbers and 35 hostages; the negotiators'