If One Rejects the Null Hypothesis When Using the Kruskal-Wallis

Multiple Choice

If one rejects the null hypothesis when using the Kruskal-Wallis H test, then:

A) all the groups differ significantly from one another.
B) at least one of the groups differs significantly from another, but you do not know which one.
C) the group ranks are similar.
D) the largest difference between a ranked pair is at least two times the smallest difference.