PTF97.S1.Q16 - Confused with the Answer

I am kind of confused as to why the answer for this question is C and not B? I feel like a may be missing the basis of the argument because it seems that it is arguing for groups over individuals and not really having to do with founder v.s. non founder.

Admin Note: Edited title. Please use the format: "PT#.S#.Q# - brief description of the question."