Question ID:PT65 S4 Q20 Passage:When teaching art students about the use of color, teachers should use colored paper rather than paint in their demonstrations. Colored paper is preferable because it readily permits a repeated use of exactly the same color in different compositions, which allows for a precise comparison of that color's impact in varying contexts. With paint, however, it is difficult to mix exactly the same color twice, and the varying textures of the applied paint can interfere with the pure effect of the color itself. Stem:Which one of the following is an assumption required by the argument? Correct Answer Choice:DChoice A:Two pieces of paper of exactly the same color will have the same effect in a given context, even if they are of different textures. Choice B:A slight difference in the color of two pieces of paper is more difficult to notice than a similar difference in the color of two samples of paint. Choice C:Changing light conditions have less of an effect on the apparent color of a piece of paper than on the apparent color of a sample of paint. Choice D:Observing the impacts of colors across varying contexts helps students to learn about the use of color. Choice E:It is important that art students understand how the effects of using colored paper in various compositions differ from those of using paint in those compositions.