Explanation:

- Option 1: Void

- An agreement with a lawful object but an unlawful consideration is not enforceable.

- Contracts need both a lawful object and lawful consideration to be valid.

- Correct Answer

- Option 2: Voidable

- Voidable contracts are valid until a party chooses to void them; they usually involve consent issues.

- This option doesn’t fit agreements with unlawful considerations.

- Option 3: Wager

- Wagering agreements involve betting and are generally void, but they differ from the scenario given.

- Option 4: Partially unlawful

- This applies when only part of the contract is unlawful, which isn't the case here.