Is D the correct answer? I am afraid not. It must be a typo; D is a total distortion of original meaning saying the art itself is not used by the artists. In addition, the modifier phrase -materials such as knickknacks and cast-offs - stands aloof without being able to modify anything.
Actually this is good topic and it is testing whether a sentence is structured giving due importance to the various parts. Here the question is what is not usually used by the artists or what the phrase -not usually employed by fine artists- is modifying. Is it the materials or the examples? If you say that the examples are the ones the modifier modifies, then we are restricting the modifier to just those two items. In fact, it is a lot more number of materials including among them the two examples that these artists do not usually employ. The original falls into this sly trap. Whereas E cleverly overcomes the pitfall, by employing a resumptive modifier- namely materials, to remind us that it is the materials that are being in fact modified rather than just the examples alone. Therefore, E must be the correct choice.
Of course, B, C are dropped for using like to describe examples.
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