Lucy wants to study changes in cognitive skills, moral reasoning, and social behavior across the lifespan. Lucy should specialize in ________ psychology.

Lucy should specialize in developmental psychology.

Developmental psychology is a branch of psychology that focuses on the growth and change of individuals throughout their lifespan. This field examines the cognitive, emotional, and social development from infancy through old age. It includes various stages of life where cognitive skills evolve, moral reasoning matures, and social behaviors are shaped by both biological and environmental factors. Researchers in developmental psychology often study how these changes occur over time and the influences that affect development, such as family, culture, and education. Thus, Lucy's interest in cognitive skills, moral reasoning, and social behavior perfectly aligns with the objectives of developmental psychology.