PT 29 S1 Q24

Automobile-emission standards are enforced through annual inspection. At ... ...

Which one of the following, if true, most strongly indicates that current enforcement of automobile-emission standards might be ineffective in controlling overall pollutant levels?
(A) As an emission-control technology approaches its limits, any additional gains in effectiveness become progressively more expensive.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 3 - Difficult/Uncommon Mix (25Q)