Final answer:
The most likely option to be classified as a necessity for which a minor will be held liable on a contract is essential medical treatment.
Step-by-step explanation:
The most likely option to be classified as a necessity for which a minor will be held liable on a contract is c) Essential medical treatment.
Essential medical treatment is considered a necessity because it is necessary for the health and well-being of an individual. If a minor enters into a contract for essential medical treatment, they can be held liable for payment.