Which of the following does NOT invalidate consent in Texas contracts?

In the context of Texas contract law, informed understanding of the terms is a fundamental element of valid consent. For a contract to be enforceable, both parties must understand the terms and conditions they are agreeing to. A party may have questions or misunderstandings, but as long as they have an informed understanding and voluntarily agree to the contract, their consent is considered valid.

On the other hand, the other options represent situations that can invalidate consent. For instance, being under duress during signing means that the party was forced or threatened to enter the contract, which compromises their ability to give genuine consent. A lack of awareness of the consequences indicates that a party did not fully comprehend what they were agreeing to, thus calling the validity of their consent into question. Similarly, the absence of a witness, while not always mandatory, can also raise issues regarding the enforceability of some contracts, especially in scenarios where witnessing is required by law.

Therefore, having an informed understanding of the terms is a necessary condition for the validity of consent and does not serve as a basis for invalidating it in Texas contracts.