In the nation 
artoria,large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities.The very largest trucks -------those with three trailers -------had less than a third of accident rate of single-and-double-trailer trucks.Clearly,therefore,one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Which of the following,if true ,most seriously weakens the argument?
A.Partoria trucking companies have so far used triple-trailer trucks on lightly traveled sectio of major highways only.
C.Very few fatal collissions involving trucks in Partoria are collissions between two trucks.
答案给的是A,可A什么意思啊，怎么就削弱了呢？我选的是C，我觉得更有可能啊，很少有事故涉及到两卡车，那就换任何
trailer也没用啊，有可能是其他车型所造成的，而非truck,希望高手们能解决一下，谢谢。
A的解释 是 那种TRUCKS事故少 只是因为用的少 不是因为安全 ，所以weaken
C选项属于无关选项，和事故发生的种类无关，只和数量有关
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