When the Effective-Interest Method of Amortization Is Used for a Bond

When the effective-interest method of amortization is used for a bond premium, the amount of interest expense for an interest period is calculated multiplying the

A) face value of the bonds at the beginning of the period by the contractual interest rate.
B) face value of the bonds at the beginning of the period by the effective interest rate.
C) carrying value of the bonds at the beginning of the period by the contractual interest rate.
D) carrying value of the bonds at the beginning of the period by the effective interest rate.