题目：
An analyst does research about duration. If the interest rate falls by 25 basis points, the price of a bond will be $106.5, and if interest rate rises by 25 basis points, the price of the bond will be $98.8. If the current price of the bond is $101.2, the duration is closest to:（）
A. 7.61
B. 15.22
C. 30.44
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
