The only option that made possible to carry goods and resources cheaply and safely from the west to the eastern and on the contrary, was the Transcontinental Railroad, because that transport way, built since 1863 to 1869 in the United States, was the world's first transcontinental railroad that achieved to connect the west with the east, generating thus a bigger expansion that enhanced and increased majorly the businesses, the commerce and the tourism, among other areas, and also that helped to the Industrial Revolution Expansion in the U.S.
So, according to the previous the correct option is B. Transcontinental Railroad.