establishment of the U.S. Department of Labor
It should be
A. Religious views
And
B. Political views
The correct answer is - natural selection.
This is a typical case of natural selection, where we have a group of people that have similar physical traits, that are selected and than isolated from any external influence, so with interbreeding they manage to keep their physical traits for generations to come and thus create a population that resembles their initial ancestors.
I believe that the answer is B
C I believe is the answer your looking for