Which of the following statements is an opinion 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.

（ ）事件开辟了航空的新纪元。 A: 1783年，法国蒙哥尔菲亚兄弟Joseph Montgolfier制造出热气球并成功升空。 B: 1891年，德国奥托·里林塔尔Otto Lilienthal的滑翔机第一次飞行。 C: 1903年，莱特兄弟驾驶他们的飞机完成第一次成功的动力飞行。 D: 1909年，法国路易·布莱里奥首次驾驶飞机成功飞跃英吉利海峡。