Within a Token-Economy System, the Solution to the Problem of Having

Within a token-economy system, the solution to the problem of having to continually reinforce the patient for each correct response is to:

A) introduce a partial reinforcement schedule.
B) implement an extinction procedure.
C) shift from a program of operant conditioning to a program of classical conditioning.
D) use punishment, instead of positive reinforcement, to control the behavior on a long-term basis.