Dennis Has Recently Begun College, and He Goes Out Drinking

Dennis has recently begun college, and he goes out drinking with his friends every week. Generally he will drink to the point that he can barely walk and has trouble talking without slurring his words. So far, he has not failed any exams, but he does prefer to drink rather than study. His use can be described as

A) substance dependence.
B) substance abuse.
C) tolerance.
D) habituation.
E) substance intoxication.