The correct answer is B) Immigrants are introducing filth into the cities and taking American jobs.
The argument would a nativist most likely support is Immigrants are introducing filth into the cities and taking American jobs.
Nativism is a policy that focused on protecting the interest of inhabitants of the United States in the times when immigration represented a real problem for America. US citizens considered that immigrants took their jobs because owners could pay low wages to immigrants. American citizens started to show some kind of hostility against immigrants from Asia and Europe.