Sarah offers to pay Allison $150 if Allison will paint her apartment while she is out of town on vacation for two weeks. Allison makes no promise but tells Sarah that she will think about it. While Sarah is out of town, Allison paints the apartment. This is best described as:

Question

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This scenario describes a unilateral contract, where Sarah made an offer that Allison could accept by performing the act of painting the apartment. Allison did not promise to paint but accepted the offer by completing the task.

Sarah Offers to Pay Allison $150 If Allison Will Paint