I think it would be ( They mainly stayed out of sight, but were in complete control of all matters big and small.) hope this helps.
The role that the Railroads played in the Southern Economy was that "They Shipped materials to Northern Markets" Their main goal was to ship crude materials.
Schools were segregated everywhere in the country
It might be B though.
The Soviet Union - they were the cause and driving force behind Communism in Eastern Europe from the 1920/30s into the 80s. Without their military power and influence, communism in Eastern Europe fell away.
