Question ID:PT88 S4 Q11 Passage:Gyms and fitness centers are sometimes good places to buy used exercise machines. When gyms and fitness centers upgrade machines, they often sell the old machines at reasonable prices. Although these exercise machines have generally seen considerable use, they are also built better than machines designed for home use and are likely to have been well maintained. Stem:Which one of the following principles, if valid, most helps to justify the reasoning in the argument above? Correct Answer Choice:CChoice A:Any good source of used exercise machines will offer at least some well-maintained machines at reasonable prices. Choice B:The best kind of used exercise machine to buy is a well-maintained machine designed for home use and offered at a reasonable price. Choice C:Any place where one can buy well-maintained, used exercise machines at reasonable prices is a good place to buy used exercise machines. Choice D:No place that sells only exercise machines designed for home use is a good place to buy used exercise machines. Choice E:No good source of used exercise machines sells any poorly maintained exercise machines at high prices.