Final answer:
Erik Erikson's psychosocial task for adulthood is 'integrity versus despair', where individuals reflect on their life achievements or regrets.
Step-by-step explanation:
According to Erik Erikson, a prominent developmental theorist, the psychosocial task to be accomplished in adulthood is known as integrity versus despair. This stage takes place during late adulthood, from the mid-60s to the end of life. In this period, individuals reflect on their lives, leading to either a sense of satisfaction and achievement, which results in integrity, or feelings of failure and wasted opportunities, which can result in despair. Erikson's theory suggests that successful resolution of this stage's conflict allows for the development of a sense of competence and a healthy personality.