If a company with a single outstanding bond issue chooses to extinguish this debt through...

Refunding involves replacing existing debt with new debt, usually to take advantage of lower interest rates.

B is correct because the company issues new bonds to pay off the existing debt.

A is incorrect as refunding involves issuing debt, not equity.

C is incorrect because the company is not obligated to buy back bonds at a discount.

D is incorrect because a sinking fund is used for gradual repayment, not refunding.