Final answer:
An offer to purchase property made by a person under the influence of alcohol is a voidable contract.
Step-by-step explanation:
An offer to purchase property made by a person under the influence of alcohol is best described as a voidable contract. A voidable contract is one that can be either affirmed or rejected by the party who was under the influence. In this case, the person who made the offer can choose to affirm the contract even after sobering up or reject it due to their impaired judgment at the time of making the offer.