Carol is most likely to reject the theory of aging because she believes that adults need to reflect and decrease their emotional investments in others as death is inevitable.
a. activity
b. wear-and-tear
c. disengagement
d. genetic preprogramming

The correct answer is option a, that is, activity.

Explanation:

On the basis of the activity theory of aging, there is a positive association in between an individual's satisfaction of life and his or her level of activity that in turn enhances that how optimistically an individual observes herself or himself and improves adjustment in the life afterward. In the given case, Carol is most probably to reject the activity theory of aging as she considers that adults require to decrease and reflect their emotional investments in others as death is a truth.