The correct answer is B) connected western farmers to markets/suppliers in industrialized East
The Transcontinental railroad had a huge impact on the economy. It allowed the transportation of goods over long distances, this was helpful to the industrial northern states. It promoted the development of fossil fuels for energy production - oil and coal - the risks of moving products were reduced.
The impact of the Transcontinental Railroad in the economy by transporting products and people led to economic growth, with this the US was responsible to manufacture 30% of the world's goods.