Nitrogen dioxide is a pollutant emitted by automobiles. Catalytic converters, devices designed to reduce nitrogen

[BTGmoderatorDC]

Nitrogen dioxide is a pollutant emitted by automobiles. Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country. Yet although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993.

Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia's capital city?

(A) More of the cars in Donia's capital city were made before 1993 than after 1993.
(B) The number of new cars sold per year in Donia has declined slightly since 1993.
(C) Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993.
(D) Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
(E) Most car trips in Donia's capital city are too short for the catalytic converter to reach its effective working temperature.


OA E

Source: GMAT Prep

[deloitte247]

Option A - Incorrect
The author didn't talk about when cars were made, he only spoke about the year catalytic converter were made necessary in Donia.

Option B - Incorrect
This is totally wrong as ut us against the summation that new cars are still being imported into the capital city.

Option C - Incorrect
This claim doesn't show any relationship with what is discussed in the passage.

Option D - Incorrect
It would have been correct but this claim doesn't explain why there has been an insignificant decline in nitrogen dioxide emission in cars.

Option E - Correct
This answer choice gives a valid reason why there is no significant decline in the emission of nitrogen dioxide, which is as a result of the fact that the catalytic converter needs more distance to function properly.