Railroads helped to transport resources, manufactured goods, and people all over North America, greatly speeding up the industrialization of the entire continent, especially the United States. Where as industrialization previously existed mostly along coastal cities where materials could quickly be shipped to and from industrial centers, the entire continent was now much more easily accessible for this.
Railroads(answer A) was the form of travel which helped in industrialization of north America in the 1800s. The railroad efficiently made large amount of goods and even bulk goods were transported effectively. In addition railroads dropped the cost transporting goods to the market.
