In the nation of Partoria, 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 the 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) Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only.

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

C) Very few fatal collisions involving trucks in Partoria are collisions between two trucks.

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

E) In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks.

Hi,

Got stuck on E. I think it is strengthening. Please let me know if i am thinking correctly.

Conclusion : one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks

Premise: Those with three trailers –  had less than a third of the accident rate of single & double trailer trucks

E says, Max legal payload (triple trailer) < 3 (max legal payload of single-trailer trucks)

Load could be one of the factors in the accident for single and double trucks).  So, it is better to increase the usage of triple-trailer truck as it is permitted for load that is less than single and double trailer trucks)

Thanks