Question

railroads not only led to an increase in the ability to transport raw materials, but they also led to a(n)
decrease in the need for raw materials.
increase in the demand for raw materials.
decrease in the uses of raw materials.
increase in the types of raw materials found in the united states.

Explanation:

Railroads improved raw material transportation. This efficiency would enable more production, thus increasing the demand for raw materials (as businesses can use more). A decrease in need/uses is illogical, and railroads don't create new raw material types. So the correct option is the one about increased demand.

Answer:

B. increase in the demand for raw materials (assuming the second option is labeled B; adjust identifier if needed based on actual labeling, but the content is "increase in the demand for raw materials")