Under contract law principles referenced inPrinciples and Practice of Insurance, a contract is only valid when both parties givefree, informed, and genuine consent. Fraud occurs when one party intentionally misleads another through deception, false representation, or concealment to induce consent. In this scenario, John intentionally misrepresented the nature of the accommodation—promising his private residence while intending to place Louise in a different, inferior property.

Because Louise agreed based on amaterial misrepresentation, the contract is voidable due tofraud, meaning she can invoke nullity and have the contract deemed without effect. Fraud differs from error in that the misinformation wasdeliberatelycreated by John. It is not lesion (which relates to unfair disadvantage in value) nor violence (which involves physical or psychological coercion). Therefore, the correct answer isB. Fraud.