Question ID:PT22 S2 Q14 Passage:Charles:  During recessions unemployment typically rises.  Thus, during a recession air pollution due to automobile exhaust decreases, since fewer people commute in cars to jobs and so cars emitting pollutants into the air are used less.Darla:  Why think that air pollution would decrease?  During a recession fewer people can afford to buy new cars, and cars tend to emit more pollutants as they get older. Stem:Which one of the following is an assumption on which Charles's argument depends? Correct Answer Choice:DChoice A:People who have never been employed drive no less frequently during a recession than they would otherwise. Choice B:Most air pollution is caused by automobile exhaust emitted by cars used by people commuting to jobs. Choice C:Most people who are employed do not use any form of public transportation to commute to their jobs. Choice D:During a recession, decreases in the use of cars resulting from reductions in commuting to jobs are not offset by increased use of cars for other reasons. Choice E:During a recession, a higher proportion of people who commute in cars to their jobs lose those jobs than do people who do not use cars to commute to their jobs.