The Benefit of the Extendible Feature of a Bond Is

The benefit of the extendible feature of a bond is that

A) it allows the issuer to extend the callable period when interest rates rise.
B) it allows the investor to continue receiving a higher interest rate for a longer period.
C) it allows the issuer the option to extend the bond during lower interest rate periods.
D) it allows the investor the option of extending the period before the bond will become callable.