[求助]大全-12-1（没有讨论出结果来）

The country of Maravia has severe air pollution, 80 percent of which is caused by the exhaust fumes of cars. In order to reduce the number of cars on the road, the government is raising taxes on the cost of buying and running a car by 20 percent. This tax increase, therefore, will significantly reduce air pollution in Maravia.

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

(A) The government of Maravia is in the process of building a significant number of roadways.

(B) Maravia is an oil-producing country and is able to refine an amount of gasoline sufficient for the needs of its population.

(C) Maravia has had an excellent public transportation system for many years.

(D) Ninety percent of the population of Maravia is very prosperous and has a substantial amount of disposable income.

(E) In Maravia, cars that emit relatively low levels of pollutants cost 10 percent less to operate, on average, than do cars that emit high levels of pollutants.（D）

这题已经搜过前人的讨论了，但是感觉并没有讲清楚，我个人觉得应该选E，D怎么看怎么像无关选项阿？？？

请高手指点。。。