Answer:
C. may be structured to pay bondholders the current value of the bond on the date of call.
Step-by-step explanation:
A callable bond is also called a redeemable bond. It a debt instrument that the issuer may decide to call or redeem before the maturity date.
This is used by bond issuers to have a cheaper cost of borrowing funds.
For example when interests are low the issuer can buy back his bonds at a lower cost this reducing his debt burden.
So callable bonds are structured to pay bondholders the current value of the bond on the date of call or redemption.