challenge: Where is the commune of Audinghen located in relation to Boulogne-sur-Mer?
  
  A. 14 miles east of Boulogne-sur-Mer
  B. 14 miles south of Boulogne-sur-Mer
  C. 14 miles north of Boulogne-sur-Mer
  D. 14 miles west of Boulogne-sur-Mer
  Answer: 