Cal is extremely edgy. He paces around his hotel room and every few minutes ducks over to the window and sneaks a look through the curtains. He is muttering to himself and tugging at his hair

His body feels clammy. His skin is crawling and his heart is pounding. He can't shake the idea that people are waiting for him outside, that maybe soon they'll be coming in to get him. What drug are these symptoms indicative of?
a) marijuana
b) barbiturates
c) amphetamines
d) hallucinogens

c