Since Ed has been a tax attorney for over 25 years, he is now able to analyze clients' problems and draw conclusions from experience-based information and knowledge. Although he does not solve problems as quickly as he did when he was younger, his solutions are more complex and therefore better. The fact that his solutions are more complex best illustrates which concepts?

CRYSTALIZED INTELLIGENCE

Explanation: basing on the fact that Ed's solutions to problems have become increasingly complex hints at the fact that he has developed what is known as crystalized intelligence.

Crystalized intelligence is defined as the accumulation of knowledge, facts, and skills that are acquired over a long period of time. This explains his ability to draw conclusions from experience-based information and knowledge when analysing issues.

Crystalized intelligence is in contrast with Fluid intelligence and are both the two factors of general intelligence first proposed by Cattell in 1971.

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