Answer:
C. neural processing speed
Explanation
Neural processing speed determine how much time a person need in order to perform a certain level of mental tasks.
When solving a complicated problems, people with higher neutral processing speed will be able to conduct and pass through several different mental process and eventually come up with a solution in a much faster rate compared to the people who have slow neural processing speed.
Because of this, researchers believe that there is a positive correlation between intelligence and neural processing speed (even though this might not be 100% the case)
