96.The difficulty with the proposed high-speed train line is that a used plane can be bought for one-third the price of the train line , and the plane, which is just as fast ,can fly anywhere,The train would be a fixed linear system, and we live in a world that is spreading out in all directions and in which consumer choose the free-wheel systems(cars,buses,aircraft), which do not have fixed routes. Thus a sufficient market for the train will not exist. Which of the following,if true ,most severely weakens the argument presented above? A. Cars,buses,and planes require the efforts of drivers and pilots to guide them,whereas the train will be guided mechanically C. Planes are not a free-wheel system because they can fly only between airports,which are less convenient for consumers than the high-speed train's stations would be. I choose A ,the Ans is C 我认为，题目中不仅仅说了飞机，也提到了bus等，所以答案中也不应该只有飞机，请指教
