11. How did railroads and oil companies benefit from their relationships in the late 19th century?
O A. The railroads allowed oil companies to send oil drillers all over the country.
O B. The railroads and oil industry united to prevent the steel industry from raising prices.
O C. The railroads charged a fee to transport oil and oil companies expanded their operations.
O D. The railroads needed oil to operate trains and oil companies sold it to them.