Compared to the Old Old and the Oldest Old,the Young

Compared to the old old and the oldest old,the young old are most likely to be economically independent,healthy,and active.These differences are not only due to the effects of aging,but they also reflect the fact that

A) the young old came of age during the post-World War II period of strong economic growth.
B) the young old grew up with social norms that emphasized independence and hard work.
C) the young old have better health care and nutrition.
D) the young old are more politically active.