A healthy adult with no signs of dementia in his or her 80s is likely to have the most difficulty doing which of the following tasks?
a. Remembering how many feet are in a mile
b. Recalling the definition of the word "antepenultimate"
c. knowing the names of his or her grandchildren
d. Solving a logic problem
Answer: D
Rationale: While the speed and flexibility of fluid intelligence tends to decline in middle and old age, the wisdom and sophistication of crystallized intelligence remains steady for those who age well.
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