Recall our discussion about the relationship between risk and return. Which one of the following statements is true?

A$.$ High yield bonds are usually safter than investment$-$grade bonds.

B$.$ Bonds with greater risk tend to have lower yields.

C$.$ The difference between a bond's yield and the risk$-$free rate is often called the risk premium.

D$.$ In the U$.$S$.,$ gvernment bonds are usually riskier than corporate bonds.