Why Is Post Hoc Statistical Testing Not Performed with a Two-Group

Why is post hoc statistical testing not performed with a two-group ANOVA?

A) A researcher is reluctant to perform a post hoc analysis that would require a more stringent level of significance.
B) The F-statistic would be invalidated by the second test.
C) If hypothesis testing reveals that a difference between groups exists, it is obvious what two groups those are.
D) Sample sizes are not large enough for this analysis.

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