The suburbs massively developed as a result of the immigrants that flocked to big cities in the late 1800s.
What role did the immigrants play?
In the 1800s, the immigrants who were low-skilled supplied labor for industrialization and helped in innovations in agriculture and manufacturing.
However, as the cities became filled with the immigrant, an effort was made to expand new immigarnt to the suburbs so to be able to continue working in the city.
Therefore, the Option A is correct.
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