A rat is trained to self-administer cocaine. Saline is substituted for the coca

A rat is trained to self-administer cocaine.  Saline is substituted for the cocaine solution, which results in extinction of responding. In this situation, the capacity for a “free” shot of cocaine to reinstate responding for cocaine can be blocked by
a. injection of AMPA into the ventromedial prefrontal cortex.
b. injection of a dopamine agonist into the nucleus accumbens.
c. glutamate induced activation of the ventral tegmental area.
d. injection of a dopamine agonist into the prefrontal cortex.
e. injection of glycine into the ventromedial prefrontal cortex. .