challenge: What was the primary purpose of the Dewoitine HD.730 aircraft designed by Emile Dewoitine's team?
  
  A. To meet a commercial requirement for a passenger airliner
  B. To meet a French Air Force requirement for a heavy bomber
  C. To meet a French Army requirement for a trainer aircraft
  D. To meet a French Navy requirement for a light catapult-launched observation aircraft
  Answer: 