Which of the Following Dispersions of Scores for Three Groups

Multiple Choice

Which of the following dispersions of scores for three groups (A,B,and C) best illustrates the null hypothesis for a Kruskal-Wallis H test?

A) The number of scores above and below the median are equal.
B) The mean differences between two groups are equal.
C) The sum of ranks in each group does not differ between groups.
D) The ranks in two groups are equal to 0.