An investor buys a 10-year, 6% annual coupon bond at par ($1,000). After one year, market interest rates drop to 4%, and the bonds price rises to $1,170.What explains why the investors return is larger than the 6% coupon rate?A. The investor avoids reinvestment risk entirelyB. The bonds face value is automatically adjusted upwardC. Coupon payments increase when rates fallD. The government guarantees higher returns when rates fall