Which of These Situations Best Exemplifies Hemispheric Migration to the United

Which of these situations best exemplifies hemispheric migration to the United States during the early twentieth century?

A) Mexican immigrants provided a critical source of labor for farms, mines, and railroads in the American West.
B) Jewish immigrants from Russia and Poland worked under harsh conditions in New York City's garment industry.
C) Many residents of western mining towns were Greek, Slavic, and Italian immigrants.
D) Japanese immigrants settled small communities near Los Angeles, where they established fishing, truck farming, and nursery businesses.