Which of the Following Distributions Approximates the Kruskal-Wallis Test Statistic

Which of the following distributions approximates the Kruskal-Wallis test statistic H when the objective is to compare k distributions and the sample sizes are greater than or equal to 5?

A) the normal distribution
B) the chi-square distribution with k - 1 degrees of freedom
C) the Student t distribution with k - 2 degrees of freedom
D) either the chi-square distribution with k - 5 degrees of freedom or the Student's t distribution with k + 5 degrees of freedom