The correct answer to this question would be alternative B)"by transporting raw materials and finished goods."
Railroads were used to push wagons loaded with raw materials and finished goods, traveling on wooden tracks.
When the railroad system advanced, it helped making it more efficient and safe in local mines, etc. Railroads were an easy and inexpensive way of transportation.
Raw materials, manufactured goods, and food were transported quickly. There was a decrease in cost of production due to railroads.