Don Enters into a Contract with Eve, Who Claims to Have

Don enters into a contract with Eve, who claims to have access to a stock-trading algorithm that will multiply an investment many times over. When the results do not match this claim, Don learns that Eve does not have access to the algorithm and files a suit, alleging fraud. Proof of an injury is required to

A) recover damages.
B) rescind the contract.
C) undo Eve's influence.
D) punish the defendant.