Marisela has announced that she is selling her car for $25,000. She also announces that her offer is good for one week. Eriberto, a hair stylist, is interested in purchasing the car. He tells Marisela that if she will give him an extra week he will style her hair for the upcoming event in which she is interested. Marisela accepts and does have her hair styled by Eriberto. During the second week of the offer Eriberto tells Marisela that according to his research her car is worth $20,000, no more. He also tells her that if she will not accept that amount he doesn't want the car.

A] On the last day of the second week Eriberto tells Marisela that he accepts her offer. He presents her with a certified check for $25,000. Marisela refuses the check saying, "My research indicates that my car is worth $30,000. That is my offer." Eriberto sues Marisela. Who wins the suit? Explain.