In a residential treatment facility for troubled youth, adolescent children receive large colored buttons when they hang up their clothes, make their beds, and come to meals on time. The children return the buttons to staff members to receive bedtime snacks or television privileges. This BEST illustrates an application of:a. systematic desensitization.
b. cognitive therapy.
c. operant conditioning.
d. virtual reality exposure therapy.

(C) Operand conditioning    

Explanation:

 The operant conditioning is one of the type of method that is used for strengthens the behavior of the person by using the reinforcement and its is also refers as the learning method.

It is one of the type of psychological behavior in which it emphasizing the given effect by providing some rewards on the basis of the particular behavior of the person.

 According to the given question, the operand conditioning is one of the best application that helps in illustrating the given situation of the children as they get some privileges when they complete their given task on time.

 Therefore, Option (C) is correct answer.