Which sentence has an incorrect shift in pronoun-antecedent agreement?

a) the dog did not know where its stick had gone.

b) both of the girls were so with their new dresses.

c) hilda and bryan presented his report to the entire class.

d) after all the children had finished lunch, they all took a nap.

The correct answer is C. Hilda and Bryan presented his report to the entire class.

Explanation:

The pronoun his doesn't correctly agree with the antecedents Hilda and Bryan. The correct pronoun would be their and not his. Hilda is a girl, and Bryan a boy, so you cannot use the same pronoun for two different genders in this case.

The other sentences have correct agreement between their pronouns and antecedents.

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the future of her and bobby