The road system change in the U.S. between 1915 and 1940 because about 16,000 miles of highways were paved by the federal government.
The road construction was essential for linking of road network around the entire country for facilitation of movement of goods and services.
Hence, the road system change in the U.S. between 1915 and 1940 because about 16,000 miles of highways were paved by the federal government.
Therefore, the Option B is correct.
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