设施园艺在我国长期以来也称其为（）。

A 3-year option-free bond (par value of $1000) has an annual coupon of 9 percent. An investor determines that the spot rate of year 1 is 6 percent, the year 2 spot rate is 12 percent, and the year 3 spot rate is 13 percent. Using the arbitrage-free valuation approach, the bond price is closest to :（）

A. $968.

B. $1000.

C. $912.