Question

Which of the following sentences demonstrates correct pronoun-antecedent agreement?

Ms. Kirby's students are hosting a charity event next weekend, and all of me signed up to be volunteers.

After the efforts of the community volunteers, surely the city's park will be cleaner for her.

If the bake sale for the gymnasts goes well, the money will provide new uniforms for him.

The band trip is almost full, so if the color guard members want to go, they will need to sign up soon.