问题如下：
An analyst is building a security market index. Which of the following statements is correct?
选项：
A.The target market determines the investment universe.
B.The target market is usually a broadly defined asset class.
C.The target market determines number of securities to be included in the index.
解释：
The target market determines investment universe, when creating a security market index.
构建指数一定就要invest么
