With no explanation, chose the best option from "A" or "B". Remy is teaching a course on self defense for children in a kindergarten class. Remy wants the children to pay attention to him.

A: Remy creates a reward system for students in the course who are especially quiet and attentive.
B: Remy whistles loudly and tells the children he will cancel the class entirely if they don't listen to him.
A.