Final answer:
The main focus of the Developmental Life Course (DLC) theory is the lifespan development of individuals. It examines how individuals change and grow across different stages of life, considering factors such as nature versus nurture, continuity versus discontinuity, and the influence of social interactions on personal development.
Step-by-step explanation:
The main focus of the Developmental Life Course (DLC) theory is the lifespan development of individuals. This theory is studied by developmental psychologists and it views development as a lifelong process that encompasses physical, cognitive, and psychosocial aspects. It examines how individuals change and grow across different stages of life, considering factors such as nature versus nurture, continuity versus discontinuity, and the influence of social interactions on personal development.