In a Home for Troubled Youth, Adolescents Receive Large Colored

In a home for troubled youth, adolescents receive large colored buttons when they hang up their clothes, make their beds, and come to meals on time. The adolescents return the buttons to staff members to receive bedtime snacks or watch TV. This best illustrates an application of

A) stress inoculation training.
B) systematic desensitization.
C) operant conditioning.
D) virtual reality exposure therapy.