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 options.
4) I also plan to organize more school dances and give my fellow students more opportunities to interact socially.

Been stuck on this for an hour.. just because they're all parallel but I can't come to a conclusion which one is the correct answer