问题
单项选择题
All else being equal, a decrease in expected yield volatility would most likely cause the price of:（）
A. both a callable bond and a putable bond to decrease.
B. a callable bond to increase and the price of a putable bond to decrease.
C. a callable bond to decrease and the price of a putable bond to increase.
答案
参考答案：B
解析：
收益波动降低会同时减少call和put的价值，而提高callable bond的价值，降低putable bond的价值。