为什么选B

问题如下：

Identify which chart, among Charts 2, 3, and 4, is most likely to be used to assess independence of independent variables.

选项：

A.Chart 2 B.Chart 3 C.Chart 4

解释：

B is correct. Chart 3 is a scatterplot comparing the values of two of the independent variables, MRKT and HML. This chart would most likely be used to assess the independence of these explanatory variables.