Question

Marcy is running for student body president. Which sentence in this excerpt from her campaign speech uses parallel structure?

1) I think I will make a good president because I am honest, trustworthy, and I’m behaving responsibly.
2) I have many plans for the student council, such as making the council more organized, to ensure everyone has a voice, and I’ll be managing meetings more efficiently.
3) I will convince the school board to install vending machines with healthier snacks in the school cafeteria and ensuring that they review the cafeteria lunch menu to include healthier meal option

Answer 1

Option 4 is the one which uses a parallel structure:
4) I also plan to organize more school dances and give my fellow students more opportunities to interact socially.

A parallel structure is a sentence that uses the same tense or form of a verb throughout. So, number 4 is the only sentence that does that - the other sentences mix a lot of forms and tenses, which shouldn't be done.