关于贝塔的解释，C为什么不对？

问题如下：

What does beta measures?

选项：

A.

The volatility of the security

B.

The joint volatility of any two securities in a portfolio

C.

The volatility of a security divided by the volatility of
the market index

D.

The relative co-movement of a security with the market portfolio

解释：

D is correct..

The relative co-movement of a security with the market portfolio

中文解析：β系数衡量的是证券收益率和市场收益率之间的相关程度。所以选D。