For Each Cart of Books That Spencer Reshelves in the Prison

Multiple Choice

For each cart of books that Spencer reshelves in the prison library,he receives a chip.He is allowed to collect chips and then trade them in for candy,extra recreation time,or visitation
Time.The prison uses a token economy,which is a method of

A) variable reinforcement.
B) continuous reinforcement.
C) positive punishment.
D) behavior modification.