How did the invention of the oil well influence the standard of living in the United States?
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(A) It led to the creation of cars, allowing people to move around more easily.
(B) It led to the creation of the radio, which allowed people to communicate over long distances.
(C) It led to the development of the sewing machine, which helped people get better quality clothing.
(D) It led to the development of railroads, which allowed people to have access to more products.
