A Patient in a Hospital Receives Poker Chips for Making

A patient in a hospital receives poker chips for making her bed,being punctual at meal times,and maintaining her physical appearance. The poker chips can be exchanged for privileges,such as television viewing,snacks,and magazines. This is an example of the

A) psychodynamic therapy technique called systematic desensitization.
B) behavior therapy technique called token economy.
C) cognitive therapy technique called token economy.
D) humanistic therapy technique called systematic desensitization.