问题如下：
According to CAPM, when the beta for an asset is negative, which of the following is most correct?
选项：
A.the expected return of an asset is less than the risk-free rate
B.the expected return of an asset equals to the risk-free rate
C.the expected return of an asset is higher than the risk-free rate
解释：
A is correct.
When asset's beta is negative, an expected return for an asset is less than the risk-free rate in the CAPM,
请问老师，什么情况下，会出现负贝塔的这种情况？
