L. l. thurstone identified seven clusters of primary mental abilities, including word fluency, memory, and inductive reasoning. he claimed that word fluencya) underlies all of our intelligent behaviors. b) is the most difficult mental ability to assess reliably. c) involves a different dimension of intelligence from that of reasoning. d) is not actually a form of intelligence.

C) involves a different dimension of intelligence from that of reasoning.

Explanation:

The theorist L. L. Thurstone presented the Two-Factor theory of intelligence which provided seven primary mental abilities. Word fluency is one of the seven primary mental abilities presented in this theory. The theorist suggests that word fluency refers to involving a different dimension of intelligence from that of reasoning. This is based on the notion that intelligence has different dimensions and that the primary mental abilities are associated with different intelligence dimensions.

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