Final answer:
The most important task in early adulthood, according to Erikson, is overcoming the challenge of intimacy versus isolation, where forming close relationships is key after achieving a solid sense of self in adolescence.
Step-by-step explanation:
According to Erik Erikson's theory of psychosocial development, the most important task in early adulthood is navigating the challenge of intimacy versus isolation. In this stage, individuals in their 20s through early 40s are tasked with developing intimate relationships with others, which is predicated upon having established a strong sense of self during adolescence. Erikson posited that a strong sense of identity is crucial for forming healthy and close relationships. Without this, individuals may experience loneliness and emotional isolation. Thus, Erikson highlighted the significance of nurturing a positive self-concept in adolescence as a foundation for seeking and maintaining intimate relationships in early adulthood.