Question

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

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.