Answer:
C. culture
Explanation:
So to explain this we have a county. This pocket of the country has all the same genetics, but this, lets say fourth of the pocket, values different things, dresses different, is just different. If you were in that group, you would be part of THAT ethical group.
Hope that answers your question.
Religion plays a major role because each culture has their own teachings of a higher power that required each civilization to make offerings of blood, dance, prayers to their superior. example: The Astecs' usually required offerings of children, farm animals, ect, for rain to grow crops that they made breads out of along with other food staples.