Final answer:
According to Erik Erikson, older people must overcome despair to achieve b. integrity.
Step-by-step explanation:
According to Erik Erikson's theory of psychosocial development, the challenge that older people must struggle with is overcoming despair to achieve b. integrity.
In late adulthood, individuals reflect on their lives and either feel a sense of satisfaction and accomplishment or a sense of failure. Those who achieve a strong sense of integrity are able to embrace their new phase in life and look back on their lives with few regrets.