10. You buy a mortgage pass through security with a 7.5% coupon rate and a 7.5% discount rate. The price at the time of purchase reflects a 10% annual prepayment rate. One hour after your purchase, the expected annual prepayment rate falls to 5%. The value of your mortgage pass through security should:

(A) remain the same

(B) rise

(C) fall

(D) the answer cannot be determined with the given information