B IS THE CORRECT ANSWER, I say this because equal amount of teachers disapprove of the students mind. Which could mean he is sarcastic about alot of his answers.
It cant be A because that just debunks everything, and what kind of teacher hates smart students lol.
It cant be C because it doesn't talk about him being a threat, it talks about his mind.
D. This could have been the answer but discussions throw it off, they talk about his mind and how he is quick to speak and talk about his interests.