I need help understanding which statistical test to use in this example.

A convenience sample of 8 adults were enrolled in one of the 3 exercise programs (3 in dancing class, 2 in a swimming class, 3 in a walking group) for 2 months (1-hour, weekly). At the end of the program, their CRP level was measured. Which statistical method should be used to compare the differences in the CRP level?

Kruskal-Wallis, Wilcoxon signed-rank, Mann-Whitmety, and Friedman test?