Marcy is running for student body president. which sentence in this excerpt from her campaign speech uses parallel structure? hi, i’m marcy! many of you know me from your ninth grade classes. i’m running for student body president because i know i can make a positive difference for you, my fellow students, and for the school. i think i will make a good president because i am honest, trustworthy, and i’m behaving responsibly. i will set a good example for the school. 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. i will take your suggestions into consideration and try to implement as many as possible. 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. a healthy student body is a happy student body! i also plan to organize more school dances and give my fellow students more opportunities to interact socially.

Four sentences in this excerpt in which Marcy uses parallel structure are: 

"I think I will make a good president because I am honest, trustworthy, and I'm behaving responsibly"

"I will set a good example for the school."

"I will take your suggestions into consideration and try to implement as many as possible."

"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."

A parallel structure is when you write a sentence using the same exact pattern of words to make the audience aware that you mean what you are saying. For instance, in Martin Luther King's speech "I Have A Dream," he uses parallel structure in it to show that he's done with racial segregation that was occurring around that time:

"Now is the time to make real the promises of democracy. Now is the time to rise from the dark and desolate valley of segregation to the sunlit path of racial justice. Now is the time to lift our nation from the quicksands of racial injustice to the solid rock of brotherhood. Now is the time to make justice a reality for all of God's children."

As you see here, Martin Luther King Jr. was using parallel structure here, and so was Marcy during her campaign speech. Hopefully, this helps.

True! this to clear up any confusion and makes questions or instructions clearer.