If J = 4, Which of the Following Statements Is

Multiple Choice

If J = 4, which of the following statements is true?

A) You should always do a priori comparisons before an ANOVA.
B) You should always do post hoc tests after an ANOVA.
C) You should always do post hoc tests to determine why H₀ was rejected.
D) You should always do post hoc tests to determine why H₀ was not rejected.