challenge: Which of the following aircraft was tested by Eric Brown, and is now on display at the National Museum of Flight in the UK?
  
  A. Messerschmitt Me 163 Komet rocket fighter
  B. Junkers Ju 87 Stuka dive bomber
  C. Focke-Wulf Fw 190 Würger fighter
  D. Messerschmitt Me 262 Schwalbe jet fighter
  Answer: 