First, let's hope that most of the time the coach is happy with the performance of his quarterback. That aside, the question is called 'rhetorical', not meant to be answered by the listener. It's not even necessary that the speaker answer it directly, as the coach does in the question. A speaker may ask a rhetorical question in the beginning of a speech or lecture, and then spend the next hour avoiding-- oh, I meant to say answering-- the question.
The correct answer is "hypophora" which is the rhetorical technique of raising one or more questions and then proceeding to answer them. This differs from the answer above "rhetorical" in that a rhetorical question is not necessarily answered. It is related to a "procatalepsis" which is when the speaker anticpates an objection and then answers it.
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