Keys Corporation's 5-year bonds yield 6.50%, and 5-year T-bonds yield 4.40%. The real risk-free rate is r* = 2.5%, the default risk premium for Keys' bonds is DRP = 0.40%, the liquidity premium on Keys' bonds is LP = 1.7% versus zero on T-bonds, and the inflation premium (IP) is 1.5%. What is the maturity risk premium (MRP) on a 5-year bond?

a. 0.40%

b. 0.60%

c. 0.30%

d. 0.20%

e. 0.50%