Alcohol just never seemed to be an intoxicating substance for him . He could drink extensively , the strongest liquor available ( and in fact his chosen beverage was Absinthe ) , but still remain completely sober . Marijuana acted much like an energy drink would to someone else .
According to the above context, choose the best option to answer the following question.
Question: Why is their friend able to drink so much ?
Options:
A. They are a large person .
B. None of the above choices .
C. They are used to the effects of alcohol .
D. They always smoke marijuana while they drink .


C