Which statement best describes the relationship between crystallized and fluid intelligence?

Which statement best describes the relationship between crystallized and fluid intelligence?

• A. Crystallized intelligence declines rapidly while fluid improves with age.
• B. Crystallized intelligence is accumulated knowledge and tends to stay stable or improve with age, while fluid intelligence covers problem-solving with novel tasks and tends to decline with age.
• C. Both are biological reflexes.
• D. Fluid intelligence is collected knowledge.

Answer: (B)