Diane, a psychologist, is examining the intrinsic factors that make stella ambitious and passionate about accomplishing her goals but make cameron indifferent to the goals assigned to him. in this scenario, diane’s research fits best into the area of specialization known as

Behavioral psychology

Explanation:

From the given case/scenario we can state that the research best fits into the category or specialization area known as behavioral psychology. Behavioral psychology also known as behaviorism, is referred as an approach in the discipline of psychology that studies behavior which is considered observable, also concentrating on the vital part that conditioning tends to play in influencing an individuals's actions and thoughts.