Which legal principle requires certain contracts to be in writing to be enforceable?

The Statute of Frauds is the correct answer because it is a legal principle that mandates certain types of contracts to be in writing in order to be enforceable in a court of law. This statute is designed to prevent fraudulent claims and misunderstandings that can arise from oral agreements. Specifically, the Statute of Frauds typically covers contracts such as those involving the sale of real property, contracts that cannot be performed within a year, and agreements where the consideration exceeds a certain monetary amount. By requiring a written record of these agreements, the Statute of Frauds ensures clarity and certainty in contractual relationships, making it easier for parties to prove their claims if any disputes arise.