A three-year treasury security currently earns 3.21 percent. Over the next three years, the real risk-free rate is expected to be 2.1 percent per year, and the inflation premium is expected to be 0.04 percent per year. What's the maturity risk premium on the three-year treasury security?

A. 4.91 percent

B. 0.71 percent

C. 0.17 percent

D. 1.51 percent