TABLE 15-4 The Output from the Best-Subset Regressions Is Given Below

TABLE 15-4

The output from the best-subset regressions is given below:

Following is the residual plot for % Attendance:

Following is the output of several multiple regression models:
Model (I) :

Model (II) :

Model (III) :

-Referring to Table 15-4, the better model using a 5% level of significance derived from the "best" model above is

A) X₁.
B) X₃.
C) X₁,X₃.
D) X₁,X₂,X₃.