Which is NOT a "primary mental ability?"

Name: Which is NOT a "primary mental ability?"
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Question

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Fluid intelligence is considered a general cognitive ability that involves reasoning, problem-solving, and the ability to learn new things, rather than a specific primary mental ability. Primary mental abilities, a concept introduced by Louis Leon Thurstone, include specific skills like numerical ability, spatial visualization, and verbal comprehension, but not broad abilities like fluid intelligence.

Which Is NOT a "Primary Mental Ability