Task: Question Understanding
Input (English): Question: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment? (A) The environment will not be polluted. (B) The environment will become more polluted. (C) Fewer pollutants will be released by vehicles. (D) Fewer pollutants will be produced by older vehicles.?
Output (English): safety, pollution, standards., impact, vehicle, inspections, environment?