Revise each sentence below to correct an error in pronoun-antecedent agreement. Underline the pronoun that you have substituted and its antecedent.

1. A police officer is highly trained to perform their duties.
2. Neither Caroline nor Jessica has decided whether they will become police officer.
3. Both Andrew and Matthew think he can become law enforcement officials.
4. Jim found out that to become a police officer you must be eighteen.
5. Each police agency has their own age and education.

My revises to these sentences are the following:
1. A POLICE OFFICER is highly trained to perform HIS duties.
2. Neither CAROLINE nor JESSICA has decided whether SHE will become a police officer.
3. Both ANDREW and MATTHEW think THEY can become law enforcement officials.
4. JIM found out that to become a police officer HE must be eighteen.
5. ?

1. HIS or HER

5. ITS
(agency is singular)

Are my answers correct?

Yes, your answers are correct.

Would my fifth question be "police agency" or "agency?"

In number 5, the antecedent is only "agency."

5. Each police agency has its own age and education requirements.

Explanation: The correct pronoun to use in this sentence is "its" to agree with the singular noun "agency". The possessive pronoun "their" is incorrect because it indicates plural ownership.