Stephanie was working late one day when her boss approached her and asked her to sign an agreement not to compete with her firm. The non-compete clause only applied to a reasonable period of time and prohibited a reasonable scope of activities. Stephanie was given a choice of whether or not she wanted to sign it. There was no benefit to signing it her boss said. Her boss felt the whole exercise was silly and he put no pressure on Stephanie to sign it. Stephanie signed it. Several years later, the clause became a legal problem for Stephanie. Based upon these facts alone, Stephanie's best argument against the enforcement of this agreement would be based upon

Accord and satisfaction

Illusory promise

Lack of consideration

Mutual rescission