The year-end adjusting entry required for bonds issued at a discount would require

a.) a debit to Bond Interest Expense, a credit to Discount on Bonds Payable, and a credit to Cash.

b.) a debit to Bond Interest Expense, a debit to Discount on Bonds Payable, and a credit to Bond Interest Payable.

c.) a debit to Bond Interest Expense, a credit to Discount on Bonds Payable, and a credit to Bond Interest Payable.

d.) a debit to Bond Interest Expense, a debit to Discount on Bonds Payable, and a credit to Cash.