Final answer:
According to Erikson's stages of psychosocial development, the primary development task of an adolescent is Identity vs. Role Confusion.
Step-by-step explanation:
According to Erikson's stages of psychosocial development, the primary development task of an adolescent is Identity vs. Role Confusion. During adolescence, individuals go through a period of self-discovery and exploration to establish a sense of identity. This involves answering questions like 'Who am I?' and 'What do I want to do with my life?'. Adolescents who successfully navigate this stage develop a strong sense of identity and are able to stay true to their beliefs and values.