I am pretty sure it would be massive because it is an English question. If you are doing a multiple choice question you should see which one fits the best. If could also be positive impact.
Answer: Dear Mr. Johnson,
There is an event next Monday at 7:00pm. I am looking for a guest speaker in business society. I was wondering if you would like to be the guest speaker. If you are willing to be the guest speaker please respond in an email by Sunday.
Explanation:
