Mark, a high school student, dislikes the fact that his moth…

Mark, a high school student, dislikes the fact that his mother yells at him in the morning to wake him up. His mother usually wakes up at 5:30 A.M., and he tries to wake up at around 5:15 A.M. to avoid listening to his mother’s yelling. In the context of operant conditioning, which type of reinforcement is being exemplified in this scenario?