An One-Way analysis of variance was conducted to evaluate the null hypothesis that there is no difference in high school students' level of satisfaction based on their family's socioeconomic status. The independent variable, socioeconomic status, included three groups: Low (M = 21.36, SD = 4.75, n = 140), Moderate (M = 24.10, SD = 4.15, n = 130), and High (M = 29.73, SD = 6.85, n = 130). The researcher found,F(2 , ? ) = 4.64,p= .01. What is the df forthe denominator?

A. F(2 ,400)

B. F(2 ,397)

C. F(2 ,403)