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An illusory promise refers to a commitment that lacks mutual obligations, making it unenforceable as a contract. In contract law, for a promise to be binding, it generally needs to be supported by consideration, which is something of value exchanged between the parties involved.

When a promise is deemed illusory, it means that one party's commitment does not actually obligate them to perform any specific action. This can occur when the language of the promise allows the promisor to decide not to follow through without facing any legal consequences. As a result, the lack of an enforceable duty means that the promise does not create an obligation that the courts would recognize or uphold.

In contrast, an enforceable promise would necessitate that both parties have clear and defined commitments to carry out specific actions or duties, thus ensuring mutual obligations exist. Options reflecting enforceable agreements and mutual commitments would not accurately describe an illusory promise.