问题如下：
Devin, Egbert, and Humphrey, financial analysts from the same investment firm, gave the following personal insights on sector indices:
Devin:Sector indices track different economic sectors and cannot be aggregated to represent the equivalent of a broad market index.
Egbert:Sector indices provide a means to determine whether an active investment manager is more successful at stock selection or sector allocation.
Humphrey:Sector indices apply a universally agreed upon sector classification system to identify the constituent securities of specific economic sectors, such as consumer goods, energy, finance, health care.
Whose statement is most correct?
选项：
A.Devin.
B.Egbert.
C.Humphrey.
解释：
The Sector Index provides a way to determine whether an active investment manager is more successful at stock selection or asset allocation.
行业指数提供了一种方法来判断一个活跃的投资经理在股票选择或行业配置方面是否更成功 能麻烦举个例子吗？谢谢！
