A client seeks advice from her solicitor about a contract which she had entered into for the purchase of an expensive car from a private seller. The sum of £47,000 was to be paid as consideration. The day before the contract was agreed, and without the seller's knowledge, the car, which was insured, caught fire and was destroyed. The client has been contacted by the seller who maintains that the money must still be paid under the terms of the contract but the money will be reimbursed to the client when the seller receives settlement from the insurance company.What is the best advice that the solicitor should give the client on the relevant law?
选项：

A:There has been a unilateral mistake by the seller as to the existence of the subject matter which renders the contract voidable by the seller who may, if he wishes, seek to enforce the contract.
B:There has been a negligent misrepresentation as to the existence of the subject matter which renders the contract voidable.
C:The contract is valid and enforceable as the subject matter of the contract was insured and the buyer can be compensated in damages.
D:There has been a mistake as to the existence of the subject matter which renders the contract voidable.
E:There has been a mistake as to the existence of the subject matter which renders the contract void.