What was the student magic?

A A trick students developed of speaking to the next person without moving their lips.
B A magic wand that students used to cheat in exams.
C A special type of notebook that contained cheat notes.
D A method of communicating with the invigilator.

Correct Answer: Option A

Explanation:
The passage states that the student magic was a trick students developed of speaking to the next person without moving their lips.