单选题 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.

【正确答案】 C

【答案解析】我们逐项进行判断，根据第一段内容我们可知A、B项为事实；根据第三段可以确定D项为事实。剩下的C项是对未来的预测，根据最后一段可以推理得出这样的结论，所以c项不是事实，应看作是一种态度。因此，答案为C。