challenge: Why did the Germans use a sailing ship, SMS Seeadler, for merchant raiding in World War I?
  
  A. Because coal-fired ships had limited access to fuel outside of Central Powers-held territories
  B. Because international regulations prohibited the use of coal-fired ships in combat
  C. Because sailing ships were faster than coal-fired ships
  D. Because sailing ships were more heavily armed than coal-fired ships
  Answer: 