Answer:
Who
Explanation:
You use whom whenever you talk about the object of a verb. But you use who to refer to the subject of the sentence.
This helps:
Whom can be replaced by him or her
Who can be replaced by he or she
I think 3. Since your first paragraph is your head, or introduction and your last paragraph is your conclusion.
That answer is inaproppiate and/or needs more info to be solved :D
