NO.PZ2015121801000003
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：
B is correct.
As illustrated in the reading, portfolios reduce risk more than they increase returns.
可以解释一下这个题的考点吗
