If the Assumption of Sphericity (I

If the assumption of sphericity (i.e., compound symmetry) is violated, what should the researcher do?

A) Because the effects of assumption violation will be minimal, we should use the results of the usual F test anyway.
B) If H₀ is rejected using the usual F test, we should use alternative F tests to verify the results.
C) If H₀ is not rejected using the usual F test, we should use alternative F tests to verify the results.
D) Because the usual F test is not valid, we cannot analyze the data using this ANOVA model.