问题如下：
Which of the following is an example of a style index? An index based on:
选项：
A.geography.
B.economic sector.
C.market capitalization.
解释：
C is correct.
Style indices represent groups of securities classified according to market capitalization, value, growth, or a combination of these characteristics.
行业指数？风格指数？还有什么指数？能不能一起列举一下，并且说明一下区别？
