In the nation of Partoria, large trucks currently have a much higher rate of traffic accidents per mile driven than other vehicles do. However, the very largest trucks—those with three trailers—had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce the number of traffic accidents would be to require shippers to increase their use of triple-trailer trucks.

Which of the following, if true, most seriously weakens the argument?


Partorian trucking companies currently use triple-trailer trucks only for long trips using major highways, which is the safest kind of trip for large trucks.

No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.

Increased use of triple-trailer trucks would mean that large trucks would account for a smaller proportion of all miles driven on Partoria's roads than they currently do.

In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.

The volume of truck traffic on Partoria's highways could be reduced by encouraging shippers to use rail transport whenever possible.

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情景：常识是不对的，最大的卡车反而是最安全的。数据表明，三个车厢的卡车在事故率上反而比一个或者两个车厢的卡车更低，因此，为了减少事故率，还是用三个车厢的卡车吧。

推理：
前提：“三个车厢的卡车”和“事故率更低”之间存在正相关关系
结论：为了让事故率更低，用三个车厢的卡车吧。

答案预估：

其它能解释为何“事故率更低”的原因。
“三厢卡车导致事故率低”的其它必要条件（常理上能保真推理出的一切结果）不存在。


选项分析：

A选项： Correct. Partoria的卡车公司目前都将三厢卡车派往车流量最少的公路上行驶。本选项给“事故率更低”的发生以另一个原因，即，因为路本身安全，所以事故率更低，并不是因为车安全。

B选项：无论Partoria对卡车的限制如何变化，Partoria仍然会让一些比较小的路不能通过大型卡车。本选项讨论的是Partoria对付卡车的原理，不能评估推理文段。

C选项：很少的事故是在两个卡车之间发生的。本选项说的是事故发生在何种交通工具上，没有提及三厢卡车出事故率低的问题。

D选项：卡车工业在Partoria的安全记录在过去的十年中上升了。本选项说的是卡车工业整体的情况，并没有告诉我们三厢卡车为何比其他的卡车事故率低，所以不能评估此推理。

E选项：在Partoria，三厢卡车的载货量少于一厢卡车的三倍。本选项讨论的是卡车载货的原理，没有提及安全率的问题，可以排除。

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