What is NOT a Requirement for a Valid Contract?

The answer is C. Written form.

A valid contract requires the following elements:

• Offer and acceptance: One party must make a clear offer, and the other party must accept it.
• Legal purpose: The contract must be for a legal purpose.
• Consideration: Each party must provide something of value in exchange for the other party's promise.

While it is often a good idea to put a contract in writing, it is not strictly required for it to be valid. A contract can be formed orally or through actions (implied contract).