Which one of the following is necessary for a contract?

A contract is formed when there is a legally enforceable agreement between two or more parties.

One of the essential elements of a valid contract is an offer, which must be made by one party and accepted by the other.

Without an offer, there can be no acceptance, and therefore, no valid contract.

Movable or immovable property is not a mandatory requirement for a contract, as contracts can be formed for various purposes, including services and agreements.

Hence, the correct answer is Offer (Option A).