Why were nativists hostile to immigrants?
a. they resented that labor unions were immigrants.
b. they were concerned that immigrants were too americanized.
c. they believed that immigrants were loyal to their home countries.
d. they feared factories would close if immigrant populations declined.

Since they felt immigrants were faithful to their native nations, nativists were concerned about immigration.

Nativists, since they were known, were staunch opponents to immigration. Immigrants, they believed, represents a danger to the manner of living they valued and treasured. Immigrants were weird individuals who spoke foreign languages that they didn't comprehend.

So, option "3" is the correct answer to the following question

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Explanation:

This scenario is the most probably between these options, because immigrants represent a lower wage work force, such that they can acquire jobs that could be able to native people.

We need to consider that nativism is a political policy which defend native people agains immigrants, supporting immigration restrictions measures. The main reason, according to books and articles, is that nativist fear that their culture could  be changed because of the great number of immigrants. But, the reasons are plenty: social, cultural and economical.

the right answer is d