NO.PZ2023021601000056
问题如下：
With respect to the formation of portfolios, which of the following statements is most accurate?
选项：
A.Portfolios affect risk less than returns.
B.Portfolios affect risk more than returns.
C.Portfolios affect risk and returns equally.
解释：
As illustrated in the reading, portfolios reduce risk more than they increase returns.为什么组合影响风险是大于收益的？风险跟收益不是差不多的么？影响风险越高，收益不也越高么？