Studies suggest that there is a positive correlation between intelligence and the

C. Neural processing speed in the brain

Explanation:

Neural processing speed  will heavily influence how much time a person need in order to solve various type of mental tasks. When we face complicated problems, we tend to require different mental process before we finally could find a solution from that problem. People with high neural processing speed can finish those different mental processes in significantly shorter period of time compared to those with neural processing speed.

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answerwake up early to start looking for work;