During the Process of Behavioral Drug Tolerance,after Repeated,frequent Use of a Drug

During the process of behavioral drug tolerance,after repeated,frequent use of a drug in the same environment:

A) environmental cues come to elicit conditioned responses that oppose the direct effects of the drug.
B) environmental cues come to elicit conditioned responses that closely resemble the direct effects of the drug.
C) one becomes "sensitized," or more sensitive,to the drug's effects.
D) environmental cues that used to elicit conditioned responses that oppose the direct effects of the drug no longer do so.