Sociologists from the "Chicago School" Studied Immigrant Groups' Assimilation Processes

Sociologists from the "Chicago school" studied immigrant groups' assimilation processes in U.S.cities.Such studies may be called research on subcultures,because subcultures

A) are groups within a larger culture.
B) almost always assimilate into the mainstream.
C) originate from foreign nations.
D) are located in remote places.