The element of contract that is not an element of a valid contract is (C) Unilateral agreement.
A contract can be described as the agreement that can be made between two or more parties and it is been recognize under the law because any breech of the contract by any of the parties can involves penalities.
From the question, the only the option that do not belong to the element of a valid contract is unilateral contract because all others bel;ongs to it such as the mutual consent.
Therefore, option C is correct.
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