问题如下：
With respect to capital market theory, which of the following asset characteristics is least likely to impact the variance of an investor’s equally weighted portfolio?
选项：
A. Return on the asset.
B. Standard deviation of the asset.
C. Covariances of the asset with the other assets in the portfolio.
解释：
A is correct.
The asset’s returns are not used to calculate the portfolio’s variance [only the assets’weights, standard deviations (or variances), and covariances (or correlations) are used].
老师 其实求asset的方差的时候，也需要return的值吧，其实归根到底，return还是会影响单个资产的方差，最终能影响到组合的方差的吧