Final answer:
Erik Erikson's fifth stage of psychosocial development is Identity vs. Role Confusion, occurring during adolescence (12-18 years), where establishing personal identity is crucial.
Step-by-step explanation:
The basic idea and timeframe of Erik Erikson's fifth stage of psychosocial development is B) Identity vs. Role Confusion (adolescence, 12-18 years). At this stage, adolescents explore their independence and develop a sense of self. Those who successfully establish their identity are able to stay true to themselves, whereas those who do not may experience role confusion and a lack of personal direction. Other stages include Trust vs. Mistrust (infancy), Initiative vs. Guilt (preschool), and Industry vs. Inferiority (school age), each emphasizing different conflicts that must be resolved to develop a healthy personality.