What is the primary focus of developmental psychology?

The primary focus of developmental psychology is on understanding how and why human beings undergo changes throughout their lifespan. This field examines the physical, cognitive, social, and emotional changes that occur at different stages of life, from infancy to old age. Developmental psychologists seek to explore various factors—genetic, environmental, cultural, and social—that influence development, making this area of study broad and comprehensive.

The other options, while they touch on aspects of development, do not encompass the full scope of developmental psychology. For instance, the exploration of biological factors in growth is a component of developmental psychology but does not capture the psychological, social, or emotional dimensions involved in human change. Focusing solely on social behaviors in adulthood ignores developmental processes in earlier life stages. Similarly, examining personality development exclusively in children restricts the understanding of how personality evolves throughout the entire life course. Thus, option A correctly identifies the overarching aim of the discipline.