Which of the following typically happens to crystallized intelligence as healthy adults age?
A) Crystallized intelligence peaks at middle age and then declines.
B) Crystallized intelligence is slowly replaced by fluid intelligence.
C) Crystallized intelligence remains stable or increases with experience.
D) Crystallized intelligence steadily declines throughout the lifespan.
Answer: C
Rationale: Fluid intelligence peaks around early to middle adulthood and then decline. In contrast, crystallized intelligence tends not to decrease in healthy adults, and may even increase with experience.
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