You want to determine if three different concentrations (25%, 50%, & 100%) are equally effective at inhibiting the growth of Streptococcus in the antimicrobial assay; which of the following statistical tests would be most appropriate to use? a) Student's paired t-test b) t-test for two independent groups c) Analysis of Variance (ANOVA) d) 2x2 contingency table (Chi-squared test)