Why is E correct? Why is C incorrect?

@Ryan-Mahabir, (E) is correct because it is directly supported by the text in lines 54-57 "..important variables such as patterns of bilingualism and rates of Mexican immigration and naturalization, and the variations in ethnic consciousness these variables help to create.." This sentence tells us that the variations in rates of naturalization and immigration in part - along with patterns of bilingualism - account for variations in ethnic consciousness as (E) states.