单选题 An analyst does research about yield spread. All other factors being equal, will the yield spread for an option-free corporate bond over the benchmark bond most likely decrease:

【正确答案】 C

【答案解析】[解析] 当经济处于衰退期时，人们对于风险更加厌恶，投资者会要求有更高的收益率溢价。当债券的信用评级被调低时，则该债券有更大的风险，投资者会要求有更高的收益率溢价。