What Is the Rationale for Avoiding the Pooled Procedures for Inference

What is the rationale for avoiding the pooled procedures for inference?

A) Testing for the equality of variances is an unreliable procedure that is not robust.
B) The two-sample t, or "unequal variances procedure," is valid regardless of whether the two variances are actually unequal.
C) The two-sample t, or "unequal variances procedure," is almost always more accurate than the pooled procedure.
D) All of these options are correct.