The Bond Horizon Premium Is

The bond horizon premium is:

A) the difference between the rates on long-term government bonds and the same maturity corporate bonds.
B) the difference between the rates on long-term government bonds and a risk-free rate.
C) the difference between rates on long-term corporate bonds and a risk-free rate.
D) the difference in returns on the longest maturity government bond and the shortest maturity risk-free rate bond.