A twenty year bond with a $1000 face value was issued with a yield to maturity of 4.3% and pays coupons semiannually. After ten years, the yield to maturity is still 4.3% and the clean price of the bond is $959.71. After three more months go by, what would you expect the dirty price to be? A. $997.71 B. $969.21 C. $978.71 D. Cannot be determined from information given