The correct answer is C) They allowed businesses access to markets farther away.
Railroads changed American business in that they allowed businesses access to markets farther away.
Without any doubt, railroads changed life in the United States. Railroads vastly improved transportation conditions and reduced the time when traveling. People could travel safer between long distances and could send more and heavier products through the train. In 1892, with the passing of the Pacific Railroad Act, the federal government authorized the construction of the Transcontinental Railroad that connected the East of the US with the Pacific West. This represented a major change in transportation and improved trade in America.