Question ID:PT81 S3 Q15 Passage:Columnist: Many car manufacturers trumpet their cars' fuel economy under normal driving conditions. For all three of the cars I have owned, I have been unable to get even close to the fuel economy that manufacturers advertise for cars of those makes. So manufacturers probably inflate those numbers. Stem:The reasoning in the columnist's argument is most vulnerable to criticism on the grounds that the argument Correct Answer Choice:AChoice A:draws a conclusion on the basis of a sample that is too small  Choice B:presumes, without providing justification, that driving conditions are the same in every geographical region Choice C:overlooks the possibility that the source of a cited claim may be biased and hence unreliable Choice D:presumes, without providing justification, that car manufacturers knowingly market cars that fail to meet minimum fuel efficiency standards Choice E:uses the term "fuel economy" in two different senses