单项选择题:
An analyst does research about relationship between credit spreads and economic well being. In general, credit spreads on corporate bonds tend to:（）
A. tighten during both economic expansions and economic contractions.
B. widen during economic expansions and tighten during economic contractions.
C. tighten during economic expansions and widen during economic contractions.
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答案：C
解析: 在经济好的情况下，收益率的溢价会降低；而在经济不好的情况下，收益率的溢价会提高，此时人们需要一个更高的收益率作为补偿。