Match each example of behavior to the correct stage of the addiction cycle.
A. Craving
Cam is angry at himself for using heroin when he was trying to quit.
B. Ritual
Cam thinks about using heroin all day while at work.
C. Using
Cam uses heroin.
D. Guilt
Cam heads for the drawer where he keeps his heroin as soon as he gets home, without even thinking about it.