If the Dependent Variable, Math Score (Y), Is About the Same

Multiple Choice

If the dependent variable, math score (Y) , is about the same for persons with higher scores in writing (X) and for those with lower scores in writing, one would expect that

A) adding the covariate will not substantially reduce error variation.
B) the adjusted mean for each group will be the same.
C) ANCOVA will be more powerful than ANOVA.
D) the covariate and factor will be independent of each other.