Question ID:PT73 S2 Q1 Passage:Editorial: The city has chosen a contractor to upgrade the heating systems in public buildings. Only 40 percent of the technicians employed by this contractor are certified by the Heating Technicians Association. So the city selected a contractor 60 percent of whose technicians are unqualified, which is an outrage. Stem:Which one of the following is an assumption required by the argument in the editorial? Correct Answer Choice:CChoice A:Certified technicians receive higher pay than uncertified technicians. Choice B:There are no contractors with fewer than 40 percent of their technicians certified. Choice C:Technicians who lack certification are not qualified technicians. Choice D:Qualified technicians installed the heating systems to be upgraded. Choice E:The contractor hired by the city has personal ties to city officials.