Opiates Such as Heroin Have Enormous Reward Value to the Brain

Opiates such as heroin have enormous reward value to the brain because they ____________ and ____________.

A) increase dopamine in the nucleus accumbens; bind with opiate receptors
B) decrease dopamine in the nucleus accumbens; bind with opiate receptors
C) increase dopamine in the nucleus accumbens; block opiate receptors
D) decrease dopamine in the nucleus accumbens; block opiate receptors