问题：An active fixed-income manager is evaluating the relative performance of an investment-grade corporate versus a high-yield corporate debt allocation in a fixed-income portfolio.Which of the following analytical model assumption changes is most likely to redue the future value of the high-yield portfolio relative to the investment-grade holdings？
您的回答A,正确答案是:C
A Steepening of the benchmark yield volatility curve
B Decreased likelihood of an economic slowdown.
C Increased likelhood of a flight to quality associated with bullish benchmark yied curve flattening (long-term rates fall by more than short-term rates do)
老师您好，请教一下这题A项，benchmark yield volatility curve steepening 不会导致HY bond 的spread上升，value下降么？谢谢！
