Patricia, a 14-year-old girl, has not been doing her math homework. Consequently, she failed her math exam. Her parents have decided to place her on restriction, so she is not allowed to talk on the phone after school for two weeks. If placing Patricia on restriction serves to decrease the number of failing math grades that she receives, then the restriction was an effective form of
A) punishment.B) classical conditioning.C) social learning.D) reinforcement