How Does $\omega$ ² for the One-Way Between-Subjects ANOVA Correct for the Fact

Multiple Choice

How does $\omega$ ² for the one-way between-subjects ANOVA correct for the fact that $\eta$ ² tends to be a biased estimate of effect size?

A) It corrects for the size of error by including MS_E in the formula.
B) It includes the degrees of freedom between groups (df_BG) in the formula.
C) It accounts for the number of groups that were observed.
D) All of these.