challenge: Where was the alternative location for a V-2 rocket launch site established by the German Army after the Watten bunker was compromised?
  
  A. Alongside the Scarpe River, east of Arras
  B. Between the villages of Helfaut and Wizernes, south-west of Saint-Omer
  C. Near the city of Lille, along the Deûle River
  D. In the vicinity of the city of Boulogne, near the English Channel
  Answer: 