[求助] 请教答案

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 pollution.

(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 pollutions cost 10 percent less to operate, on average, than do cars that emit high levels of pollutions.