For Over a Month,Ruth Studies Every Night for Four Hours

Multiple Choice

For over a month,Ruth studies every night for four hours in order to do well in her college courses.However,she is beginning to feel left out of things because she is losing so much fun time with her friends.Ruth then reduces her night studying time,thus illustrating the influence of:

A) positive punishment.
B) negative punishment.
C) positive reinforcement.
D) negative reinforcement.