Discussion
Crystallized abilities include the ability to use skills, knowledge and experience. These abilities tend to :
Answer: A
Crystallized abilities tend to improve with age as individuals expand their knowledge through experience.
Cattell and Horn distinguished fluid intelligence (reasoning about new problems, which peaks in early adulthood and then declines) from crystallized intelligence (accumulated knowledge, vocabulary and skills). Crystallized abilities continue to grow through middle age and remain stable or decline only late in life.
The decline described in option B is typical of fluid abilities, not crystallized ones, and the options saying they stay static or do not change miss their growth with experience.
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