Answer:
has been reinforced in the past for similar behaviors.
Step-by-step explanation:
B.F. Skinner was an American psychologist and more often called the father of Behaviorism. Instead, of studying psychology from an internal perspective, he focused on the external factors of the environment which are reward and punishment to shape the behavior of an individual. His theory of Operant Conditioning states that a behavior is repeated by the reinforcement.
As per the question, according to the theory of Operant Conditioning, Ryan's behavior of aggression must have been reinforced in the past by similar behavior.