Mike Was Always Interested in Being Popular, So During His

Multiple Choice

Mike was always interested in being popular, so during his sophomore year in high school he began to use marijuana so he would fit in. After using it for little over a year, he began to need it to relax and also had to use more of it to get the same effect. He then started to use cocaine to get the same effect. He noticed that, when he was not under the influence of the drug, he felt irritable and anxious. When Mike found that he had to use more of the marijuana to get the same relaxing state, he was experiencing

A) tolerance.
B) reinforcement.
C) loss of control.
D) escalation.