Which Nonparametric Test Would We Use to Compare Ratings Assigned

Multiple Choice

Which nonparametric test would we use to compare ratings assigned to n pairs of bonds by two different rating agencies, if the bonds are rated on an ordinal scale (Aaa, Aa, A, Baa, Ba B, etc.) ?

A) Wald-Wolfowitz one-sample runs test
B) Wilcoxon signed-rank test
C) Wilcoxon rank sum (Mann-Whitney) test
D) Kruskal-Wallis test