The correct answer here is C.
The Cold War was waged on many fronts. They may not have been literal fronts in classic sense but fronts nonetheless. There were proxy wars but also cultural and economic wars as well. The reduction of oil prices by Saudi Arabia were significant because they hurt the struggling economy of the Soviet Union.
Answer:
The railroad became a way for companies to ship to each other from across the country, transport raw materials to factories, and send final products to consumers.
