Answer: c. can be voided based upon fraud in the inducement .
Step-by-step explanation:
Brad knew exactly what kind of stone it was that Andrew had and yet proceeded to lie about it in order to induce a sale at a much lower price than the actual worth of the jewel .
The contract is therefore voidable because the Brad committed fraud by lying and obtaining the diamond at $50 under false pretenses. Andrew should therefore drag him to the Courts of law to face justice.