NO.PZ2018070201000001
问题如下：
Which of the following statements about portfolio method is correct?
选项：
A.
Investors should use a portfolio approach to reduce the overall volatility of returns.
B.
Investors should use a portfolio approach to monitor overall volatility of returns.
C.
Investors should use a portfolio approach to eliminate the overall volatility of returns.
解释：
A is correct.
The volatility of the portfolio can be reduced by combining assets . Holding porfolios can help individuals and institutions to reduce risk. However, because of the impact of economic change during a period, the risk may not reduce as much as expected.
这题中reduce和eliminate有啥区别？谢谢