Which of the following can render a valid contract unenforceable?

A valid contract can become unenforceable for several reasons, and the circumstances surrounding coercion, the age of the buyer, or the absence of valuable consideration are critical in this context. When a contract is formed, all parties must enter into the agreement voluntarily and must have the legal capacity to do so. If one party is coerced into agreement, the contract is regarded as voidable because genuine consent is lacking. Additionally, if one of the parties is a minor, they typically lack the legal capacity to enter into contracts, which renders the agreement unenforceable at their discretion. Lastly, a contract must involve valuable consideration; if it does not, meaning that something of value is not exchanged, the contract is generally unenforceable in court.

Other options refer to scenarios that may affect contract validity but do not meet the legal standards to make the contract necessarily unenforceable. An unreasonable term could lead to disputes but does not automatically void the contract. Similarly, while one party changing their mind post-agreement can lead to complications, it does not inherently render the contract unenforceable unless additional factors are involved. Misrepresentation of property value can lead to claims of fraud or rescission but may not immediately affect the initial enforceability of the contract unless it's