Measures of brain activity during tasks requiring intelligence indicate that, in order to solve the same problem, the brains of people with high scores on standard intelligence measures ____

a. ?do not have to work as hard as the brains of people with lower scores
b. ?work harder than the brains of people with lower scores
c. ?work more quickly than the brains of people with lower scores
d. ?work less quickly but more accurately than the brains of people with lower scores

ANSWER:
a