The best title for this passage is ______.

A．the weight of the hang glider and that of the ultralight airplane
B．ultralight airplanes and military aircraft
C．the inventiveness of John Moody and that of Dctave Chanute
D．the controls used in the Wright brothers' Flyer and those used in today’s ultralight airplanes

A．Ultralight planes use snowmobile engines that let them cruise at about 500 miles per hour.
B．John Moody used a 12-horsepower engine to power his Icarus II hang glider.
C．The use of ultralight planes will increase in such areas as crop dusting and aerial photography.
D．Otto Lilienthal made more than 2000 flights in Germany in the 1890’s in what were actually hang gliders.