When There Are Unequal Sample Sizes in the Cells of a 2

Multiple Choice

When there are unequal sample sizes in the cells of a 2 x 2 factorial between subjects design,modification of the ANOVA techniques are necessary because

A) the within-group variability is different in all four groups.
B) the within-group variability is the same in all four groups.
C) the two independent variables are related to each other in the population.
D) the two independent variables are related to each other in the sample.