Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?

A)The appendix can be surgically removed with no immediate ill effects.
B)The appendix might have been larger in fossil hominids.
C)The appendix has a substantial amount of defensive lymphatic tissue.
D)Individuals with a larger-than-average appendix leave fewer offspring than those with a below-average-sized appendix.
E)In a million years, the human species might completely lack an appendix.