You purchased a zero-coupon bond one year ago for $73. The par value of the bond is $1,000. The market interest rate has remained the same during the past one year. If the bond had 30 years to maturity when you originally purchased it, and you sold your bond today, what was your total return for the past year?

A: -9.12%

B: 11.55%

C: 9.12%

D: -11.55%