Final answer:
The correct answer to the student's question is c) Voidable, as a voidable contract allows the innocent party to decide whether to void or validate it.
Step-by-step explanation:
A voidable contract is defined as one that may be treated as void or valid at the option of the innocent party. Therefore, the correct answer is c) Voidable. A voidable contract is typically valid and enforceable on the face of it, but due to certain circumstances such as misrepresentation, undue influence, coercion, or fraud, the injured or innocent party may have the legal right to cancel or avoid the contract. If the innocent party chooses to affirm the contract despite the defect, the contract remains valid and enforceable.