The correct answer is B. Punches his air with his fists and makes growling sounds.
Explanation
In the sentence, the phrase "crazy things" is very broad and can be interpreted in many ways. For this reason, if you want to give a more precise sense of the complete meaning of the sentence, it would be appropriate to replace the phrase "crazy things" with something more specific. Therefore, the correct answer is B. Punches his air with his fists and makes growling sounds, because this option specifies the attitude that Alex takes when he is mad.
I'm pretty sure the highlighted phrase should be "like fraternities and sororities" because it adds unnecessary details, possibly leaving out ones which are more important.
