Sounds like either 2 (The lessons we take from obstacles we encounter can be fundamental to later success. Recount a time when you faced a challenge, setback, or failure. How did it affect you, and what did you learn from the experience?) or 5 (Discuss an accomplishment, event, or realization that sparked a period of personal growth and a new understanding of yourself or others.) depending on how you conclude it.
So you overcame your fear of speaking. Why was this important to you? Did you learn something from the experience? Did a new period of personal growth follow? Did you gain a new understanding of others? Whatever you got out of that as discussed in your essay will guide exactly which prompt to choose.
There is a free essay reader service here on CC. I don’t think it matters which prompt you choose, as long as you respond appropriately to it. It would be easier to answer and help you after you have written the essay. Then request help here: