challenge: What features does the 'semi-flying' scow designed in France include?
  
  A. Wings/foils, telescopic canting keel, retractable bowsprit, and asymmetrical spinnaker
  B. Canting mast and retractable centerboard
  C. Retractable rudder and symmetrical sails
  D. Hydrofoils and a fixed keel
  Answer: 