Final answer:
Erikson's sixth stage of psychosocial development, Intimacy vs. Isolation, occurs in young adulthood (ages 18-40) and involves challenges of forming intimate relationships vs. avoiding isolation.
Step-by-step explanation:
The basic idea and timeframe of Erik Erikson's sixth stage of psychosocial development is not included in the options provided in the question. Erikson's stages each reflect a dual possibility and task within a specific range of ages. Options A) Trust vs. Mistrust, B) Autonomy vs. Shame and Doubt, C) Initiative vs. Guilt, and D) Industry vs. Inferiority correspond to the first four stages of development, with the specific timeframes ranging from infancy to school age. As for the sixth stage, it is known as Intimacy vs. Isolation and occurs in young adulthood, roughly between the ages of 18 and 40. This stage revolves around forming intimate, loving relationships with others and the challenge of avoiding isolation and loneliness.