An officer arrived at a bar and encountered a person inside who was intoxicated. This person reeked of an odor of marijuana, had bloodshot eyes, dry mouth, slow and deliberate speech. The subject was unable to care for self and admitted to using marijuana. What should the officer arrest the person for?
a) Public intoxication
b) Driving under the influence (DUI)
c) Disorderly conduct
d) Possession of a controlled substance