The current price of a corporate bond issued by TMV is $1,030 with annual coupon payments. The YTM on TMV's bond is 8%. Using the duration model, you estimate that when the YTM increases to 8.1%, the price of the bond will go down to $1,020. What is the duration of TMV's bond? A. 9.5 years B. 10.5 years C. 8.5 years D. 7.5 years