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Use the interrogative pronoun which? for both people and things, when it asks for one out of a definite number.
The interrogative pronoun what? doesn't imply choice: What's your telephone number? It's also used to ask for a person's profession. What's your father? - He's a lawyer.
The word reason denotes cause, therefore the reason is because is repetition. The correct idiom is the reason is that ...
In the first sentence who is the subject of will be chosen, do you think is a parenthesis. In the second sentence whom is the object of I saw, do you think is a parenthesis