"dr. chen studies several traits that distinguish one person from another. dr. doherty investigates how people grow and change during late adolescence and young adulthood. dr. chen is a psychologist; dr. doherty is a "

Developmental psychologist and Personality psychologist

Explanation:

Developmental psychology is defined as the scientific study of why and how human beings change over the period of their lifetime.

It is originally concerned about the development, aging and entire lifespan.

Personality psychologist observe the social situations and how they are influenced by individual emotion and conduct.

They tend to express the behavior of person under stress conditions, attraction,  aggression, persuasion.

what are the choices?