You wish to buy a corporate debt security that pays $80 at the end of each year for three years. At the end of year 3, you will be paid $1,000. Suppose your required interest rates in the first, second and third year are 6%, 6.8% and 7.6% respectively, how much would you pay for the debt security? A. 891.23 B. 963.45 C. 991.37 D. 1012.33 E. 1032.75