One Aspect of Darwin's Theory of Natural Selection Is That

Multiple Choice

One aspect of Darwin's theory of natural selection is that adaptations not useful to fitness are lost faster if they have a greater cost. With this in mind, which of the following explanation is most likely true?

A) It is a mystery why we do not have tails.
B) Our little toe is not going away in the near future.
C) The human appendix must currently serve an essential function or it would not be in our bodies.
D) Humans are relatively hairless because we look better without hair.