Question

Which of these sentences has an error in pronoun-antecedent agreement? A. Each of the assistant principals takes turns working at the games on Friday nights. B. Everyone enjoyed having shorter classes on the day of the pep rally. C. Sarah and Robert treated themselves to frozen yogurt after a hard week of school. D. Nobody forgets the first time they make the winning play in a game.

Answer 1

D. Nobody forgets the first time they make the winning play in a game.
Has an error in pronoun-antecedent agreement.

Nobody, an indefinite pronoun, is always singular. They is in plural form. It does not agree with the singular nobody in the sentence based on the pronoun-antecedent agreement. 

Answer 2

Sentence D has an error in pronoun-antecedent agreement.

A pronoun is a word that is used as a substitution for a noun and the antecedent is the word for which the pronoun stands. Pronoun antecedent agreement means that the pronoun must agree with the antecedent in number.

In sentence D, "nobody" is singular while the pronoun "they" is plural. In this sentence, the pronoun "they" refers back to "nobody" as its antecedent. but "nobody" is a singular indefinite pronoun. Thus, there is an error in pronoun-antecedent agreement.