One Could Argue That If "Survival of the Fittest" Is

One could argue that if "survival of the fittest" is how the world works, it's acceptable to exploit your fellow humans for personal gain. Obviously this is morally questionable, but does it make sense scientifically?

A) Yes, natural selection applies to human society just like everything else.
B) Yes, scientists tend to be immoral.
C) No. Nothing about evolution applies to humans at all.
D) No. Human society is too complex to be explained by biology alone.
E) No. Natural selection doesn't apply to anything.
Biology in Perspective (Becoming an informed Citizen)