问题如下：
When creating a security market index, the target market:
选项：
A.determines the investment universe.
B.is usually a broadly defined asset class.
C.determines the number of securities to be included in the index.
解释：
A is correct.
The target market determines the investment universe and the securities available for inclusion in the index.
为什么目标市场决定了投资范围 ？（investment universe是投资范围吗？）a broadly defined asset class是什么？
