A company issues a ten-year bond at par with a coupon rate of 6% paid semi-annually. The YTM at the beginning of the third year of the bond (8 years left to maturity) is 7.8%. What was the percentage change in the price of the bond over the past two years?
a) 11.81%
b) -43.04%
c) -10.56%
d) 75.55%