Answer: Option " C. Even though a bond has a substantial initial interest rate, its return can turn out to be negative if interest rates rise. " is generally true of all bonds.
Explanation: The negotiation of bonds in the open market can lead to a negative return on the bonds if the price of the bonds is negotiated with a sufficient premium. Remember that bond prices change inversely with the yield of a bond, the higher the price of a bond, the lower the yield. At some point, the price of a bond may increase enough to imply a negative return for the buyer.