Answer:
- Fourth choice: The tennis instructor can only give an hour of their time this week.
Step-by-step 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.