A Agrees in Writing to Buy B's Property for $20

A agrees in writing to buy B's property for $20 000.00.The agreement states that A shall have five days from the date of the agreement to find mortgage financing.A is unable to find mortgage financing in five days and notifies B.In this case

A) the contract has been discharged by operation of a condition subsequent.
B) the contract has been discharged by waiver.
C) the contract has not been discharged.
D) the contract has been discharged by operation of a condition precedent.
E) the contract has been discharged by novation.