Question ID:PTJ2007 S2 Q13 Passage:Standard aluminum soft-drink cans do not vary in the amount of aluminum that they contain.  Fifty percent of the aluminum contained in a certain group (M) of standard aluminum soft-drink cans was recycled from another group (L) of used, standard aluminum soft-drink cans.  Since all the cans in L were recycled into cans in M and since the amount of material other than aluminum in an aluminum can is negligible, it follows that M contains twice as many cans as L. Stem:The conclusion of the argument follows logically if which one of the following is assumed? Correct Answer Choice:CChoice A:The aluminum in the cans of M cannot be recycled further. Choice B:Recycled aluminum is of poorer quality than unrecycled aluminum. Choice C:All of the aluminum in an aluminum can is recovered when the can is recycled. Choice D:None of the soft-drink cans in group L had been made from recycled aluminum. Choice E:Aluminum soft-drink cans are more easily recycled than are soft-drink cans made from other materials.