a partial security's default risk premium is 2.20 percent. for all securities, the inflation risk premium is 1.05 percent and the real intrest rate is 0.50 percent. the security's liquidity risk premium is 1.55 percent and maturity risk premium is 0.45 percent. the security has no special covenants. what is the security's equilibrium rate of return?

A. 8.50%

B. 9.00%

C. 5.75%

D.6.70%