Final answer:
An offer for a unilateral contract is accepted through performance, rather than by a return promise.
Step-by-step explanation:
An offer for a unilateral contract is a promise to perform in exchange for a requested performance, and acceptance is achieved by that requested performance rather than by a return promise. In a unilateral contract, the offeror is the one who seeks acceptance through performance, while the offeree accepts the offer by performing the action requested.