Which of the following best describes the chemical structure of alcohols?
a. Alcohols are organic compounds with one or more hydroxyl (-OH) groups attached to a carbon atom.
b. Alcohols are organic compounds characterized by the presence of a carbonyl group (C=O) attached to a carbon atom.
c. Alcohols are organic compounds containing a nitrogen atom bonded to one or more carbon atoms.
d. Alcohols are organic compounds with a carboxyl group (-COOH) attached to a carbon atom.