Which scenario would classify a contract as void?

A contract is classified as void when it involves an illegal purpose or transaction, meaning that it cannot be enforced by law. In this case, a contract committing a crime falls into that category; since it involves actions that violate the law, it's inherently unenforceable. Such contracts are considered null from the outset, as legal agreements must adhere to lawful standards for them to be considered valid and enforceable.

In contrast, contracts pertaining to the sale of property or those made between competent adults are generally valid unless other factors—like duress—apply. A contract made under duress can be valid but may be voidable at the discretion of the coerced party, meaning it is not automatically void. Overall, the defining characteristic of a void contract is its illegality, which aligns specifically with contracts committing a crime.