Answer: Developmental Psychologist
Explanation:
The developmental physiologist is one of the concept of studying the development and growth of the human throughout the lifespan and it is the process of managing the social, perceptual, cognitive and the personal growth.
According to the given scenario, the given research question statement is particular interest in the developmental psychologist as it helps in managing all the emotions of human from infancy to the mature age.
Therefore, Developmental psychologist is the correct answer.