问题如下：
Total risk is the sum of:
选项：
A. systematic and nondiversifiable risk.
B. market and nondiversifiable risk.
C. Non-systematic and market risk.
解释：
C is correct.
Total risk equals non-systematic risk plus systematic risk (market risk). Non-ststematic risk is diversifiable, and systematic risk cannot be diversified.
market risk =systematic risk的话？capm模型中β（Rm-Rf）又怎么理解对系统性风险的补偿呢？
