which of the following bonds would be cheapest to deliver given a T-note futures price of 80.7524? (Assume that all bonds have semiannual coupon payments based on a par value of #100.)

a. 8-year bond with 7% coupons and a yield of 8.5%

b. 8.5- year bond with 8% coupons and a yield of 9.5%

c. 8.5 -year bond with 6.5% coupons and a yield of 7.5%