Which sentence has a pronoun that disagrees with its antecedent?

Each team member put his or her baseball glove in the box.

Ashley remembered she would need new cleats for the game.

We need someone to be the coach for our softball team.

The tennis instructor can only give an hour of their time this week.

Fourth choice: The tennis instructor can only give an hour of their time this week.

Explanation:

The fourth sentence has a pronoun that disagrees in number with its antecedent.

The pronoun is ¨their" which is plural for the third person. That means that it is referring to more than one person.

The antecedent is "the tennis instructor". This is a singular name. It means one instructor, not two or more.

So, the antecedent is singular and the pronoun is plural which is a pronoun-antecedent disagreement in number.