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 softdrink 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. The conclusion of the argument follows logically if which one of the following is assumed? ['The aluminum in the cans of M cannot be recycled further.', 'None of the soft-drink cans in group L had been made from recycled aluminum.', 'Aluminum soft-drink cans are more easily recycled than are soft-drink cans made from other materials.', 'All of the aluminum in an aluminum can is recovered when the can is recycled.']