In 20XX, the 10-Year Treasury Rate Was 4

In 20XX, the 10-year Treasury rate was 4.5 percent while the average 10-year Aaa corporate bond debt carried an interest rate of 6.0 percent. What is the average default risk premium on Aaa corporate bonds?

A) 0.75 percent
B) 1.5 percent
C) 1.95 percent
D) 2.25 percent