Answer:
D. immigrants would take jobs from people born in the United States.
Explanation:
In the 19th century, nativists were primarily concerned that immigrants would compete for jobs and lower wages for native-born Americans. They feared the economic impact and cultural changes that could result from the influx of immigrants, particularly those from non-Protestant countries, who they believed would undermine traditional American values. This sentiment was especially strong during periods of economic hardship when jobs were scarce.