单选题 The one-year spot rate is 6 percent and the one-year forward rates starting in one, two and three years respectively are 6.5 percent, 6.8 percent and 7 percent. What is the four-year spot rate?

A、

A. 6.51%.
B、

B. 6.58%.
C、

C. 6.57%.

【正确答案】 C

【答案解析】
The four-year spot rate is computed as follows:
Four-year spot rate =[(1+0.06)×1+0.065)×(1+0.068)×(1+0.07)]^1/4-1=6.57%