4. Mick, a successful author, has been drinking alcohol for 10 years. He feels that alcohol relaxes him and expands his mind, which makes him a more creative writer. In fact, he never attempts to write unless he has first had a drink. Mick has tried to stop drinking in the past, but he has always returned to it because he fears losing his creativity. Mick’s behavior is best explained by .

a. substance use disorder

b. withdrawal symptoms

c. the margin of safety

d. tolerance