Khristof, Who Is Rather Shy, Is Drinking Some Punch That

Khristof, who is rather shy, is drinking some punch that has been spiked with alcohol. Within an hour, he approaches a woman he has had a crush on and tells her how pretty she is. "I've always wanted to ask you out, so no time like the present," he tells her. Khristof is acting this way because alcohol is a(n)

A) opiate that excites the limbic system.
B) hallucinogenic drug.
C) CNS depressant drug.
D) CNS stimulating drug.