Which security should sell at a greater price?

a. A 5-year Treasury bond with a 7.00% coupon rate versus a 5-year Treasury bond with a 3.00% coupon.

b. A 10-year Treasury bond with a 5% coupon bond versus a 20-year Treasury bond with a 5% coupon.

c. A 10-year Treasury bond with a 5% coupon bond versus a 10-year BBB corporate bond with a 5% coupon.