Which of the following is necessary to legally void a contract?

To legally void a contract, misrepresentation of pertinent information is essential because it undermines the validity of the agreement. When one party provides false information or omits key details that are important to the contract's execution, it can impact the other party's consent. This situation often leads to a lack of a mutual understanding and agreement on the terms, allowing the misled party to void the contract. Essentially, the presence of this misrepresentation means that the necessary conditions for a valid contract—such as informed consent—are absent.

The notion of mutual agreement from both parties, express malintent, or the requirement of a witness signature does not inherently affect the validity of a contract in terms of its enforceability. While those factors can influence contract disputes or issues, they do not encapsulate the key principle that misrepresentation violates the foundational elements of contract law. Thus, misrepresentation serves as a strong legal basis for rendering a contract void.