Which of the following is most accurate regarding research on self-development in middle adulthood?  a. Enhanced self-development is most likely among those who have the best physical health and...

Which of the following is most accurate regarding research on self-development in middle adulthood?

 a. Enhanced self-development is most likely among those who have the best physical health and social relationships.

 b. There is no evidence of self-development among middle aged people living in collectivistic cultures.

 c. Across cultures during middle adulthood, contentment with the self shows a small but significant decline as people confront a number of physiological changes.

 d. Middle-aged adults’ enhanced self-development makes them less likely to adapt to new situations or to be flexible in their goals.