Based on Early Accounts, Many Early Anthropologists Assumed Descent Groups

Based on early accounts, many early anthropologists assumed descent groups would be key to understanding how cultures outside of Europe and North America were organized. Why might this have been the case?

A) Their own extensive fieldwork had already established this as true.
B) The narratives of travelers from other parts of the world reflected this idea.
C) Most European and North American cultures are not organized around descent groups, so early anthropologists assumed the opposite would be true elsewhere.
D) The inability of early anthropologists to speak local languages resulted in confusion about relationships.