After being fired from his job, Mel drank almost a quart of vodka and decided to ride the bus home. While on the bus, he saw a briefcase he mistakenly thought was his own, and began struggling with the passenger carrying the briefcase. Mel knocked the passenger to the floor, took the briefcase, and fled. Mel was arrested and charged with robbery. Mel should be 
acquitted, because he used no threats and was intoxicated.  acquitted, because his mistake negated the required specific intent.  convicted, because his intoxication was voluntary.  convicted, because mistake is no defense to robbery.