After Years of Using Cocaine, John No Longer Seemed Like

After years of using cocaine, John no longer seemed like the same person to his family. He showed poor ability to make decisions and had difficulty resisting the urge to act impulsively. If we examined John's brain, what would we expect to see that would account for cocaine's impact on John's behavior?

A) John will have less activity than expected in his prefrontal cortex.
B) John will have less activity than expected in his temporal lobes.
C) John will have more gray matter than expected in his prefrontal cortex.
D) John will have more gray matter than expected in his temporal lobes.