Qian Papa invests in a corporate bond, whose market price is 900 yuan, par value is 1000 yuan, coupon rate is 8%, interest is payed once a year and there are 10 years before maturity. Qian Papa wants to know what is the rate of return of this bond? A: 9.49956% B: 9.59956% C: 9.69956% D: 9.69656%