Developmental psychology is the study of: a) the language, personality, and emotions of children and adolescents b) the stages of life and the important tasks of each c) progressive changes in behavior and abilities from conception to death d) the role of maturation in the unfolding of human potential.

Answer: C) progressive changes in behavior and abilities from conception to death

Explanation: Developmental psychology can be simply defined as a scientific approach that tends to study why and how human beings grow both in behaviors and abilities through out their life span. It puts into consideration the environment surrounding of the person as well as the nurture (the way that person was brought up/upbringing) and how the person has changed right from conception to death. Developmental psychology tries to explain how the feelings and way of thinking as well as behavior changes over the course of time.