The interest rate of a bond is equal to the

• A.difference between the face value and the initial price all divided by the face value.
• B.difference between the face value and the initial price.
• C.difference between the face value and the initial price all divided by the initial price.
• D.sum of the face value and the initial price all divided by the face value
• E.sum of the face value and the initial price all divided by the initial price.