Hiroaki Teaches Karate at a Large Martial Arts Studio

Hiroaki teaches karate at a large martial arts studio. He emphasizes self-discipline and self-motivation throughout the class. At the end of class, he always gives students a piece of candy from the treasure chest as reward for good discipline. One week he was out of candy, and several students threw tantrums, showing a lack of self-discipline. What should Hiroaki do if he wants students to show self-discipline even when there is no reward?

A) discuss the lifelong benefits of self-discipline
B) praise students showing self-discipline during class
C) continue to provide candy for showing self-discipline
D) provide rewards at the end of class other than candy
E) stop placing an emphasis on self-discipline and other values