Answer:
C. alcoholism
Step-by-step explanation:
Alcoholism: The term alcoholism is referred to the alcohol abuse which states that an individual experience a long-term addiction to consuming alcohol.
An alcoholic person doesn't know where, how and when to stop drinking and the person consumes as much as he or she can consume alcohol and this is a major cause for spoiling the personal relationship and create a serious problem at work and home.
In the question above, Keith's drinking behavior is best described as alcoholism.