Which of the Following Is Most Accurate Regarding Research on Self-Development

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.