Mark has been using crack for two years.Although he has tried repeatedly to give it up, the crash is so intense and his cravings for the rush are so strong

Mark has been using crack for two years.Although he has tried repeatedly to give it up, the crash is so intense and his cravings for the rush are so strong he just can’t quit.What is demonstrating?
A)substance use
B)physiological dependence
C)psychological dependence
D)substance intoxication


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