Final answer:
Option (c), In the mid-19th century, nativists opposed Irish and German immigration due to fears of job competition and cultural change, and formed organizations to restrict immigration.
Step-by-step explanation:
Nativists in the mid-19th century opposed the influx of Irish and German immigration. They feared these new immigrants would compete for jobs and lead to unwanted cultural changes. The correct answer to the question is c) Nativists opposed immigration, fearing job competition and cultural change.
Examples of nativist responses include creating organizations like the American Protective Association and the Immigration Restriction League, which pushed for policies that restricted immigration and discriminated against the incoming populations based on their ethnicity and religion.