Answer: Behavioral psychology
Step-by-step explanation:
The behavioral psychology is basically refers to the study of behaviorism, minds, emotions, perceptions and behavior in the environment.
The behavioral psychology basically helps in improving and also changing the individual person's behavior, thoughts and their emotions.
According to the given question, Devon is interested in studying the different types of behavior and this is know a s the behavioral psychology. It is also called as the cognitive behavioral psychology system.
Therefore, Behavioral psychology is the correct answer.