If a company's bonds are currently yielding 8% in the marketplace, why would the entity's cost of debt be lower than this?

If a company’s bonds are currently yielding 8% in the marketplace, why would the entity’s cost of debt be lower than this?

If a company’s bonds are currently yielding 8% in the marketplace, why would the entity’s cost of debt be lower than this?
A . There should be no difference; the cost of debt is the same as the bond’s market yield.
B . Interest is deductible for tax purposes.
C . The company’s credit rating has changed.
D . Market interest rates have decreased.

Answer: B