Consider a completely randomized design with five treatments, A, B, C, D, and E. The ANOVA F-test revealed significant differences among the means. A multiple comparisons procedure was used to compare all possible pairs of treatment means at a = .05. The ranking of the five treatment means is summarized in each part below. Identify which pairs of means are significantly different.
a. A C E B D
b. A C E B D
c. A C E B D
d. A C E B D