The Best Tasting Ice Creams Are Generally High in Fat

The best tasting ice creams are generally high in fat content, which gives them a creamy texture. Four brands of ice cream (two national and two local) were tested by consumers who rated how "creamy" they tasted on a 5-point Likert type scale (1 = not creamy to 5 = very creamy) . Each brand was rated by a different group of consumers. The appropriate nonparametric method to use for these data is the

A) Kruskal-Wallis test.
B) Kendall's tau test.
C) Wilcoxon signed-rank test.
D) Wilcoxon rank-sum test.
E) Spearman's rho test.