Answer:
D) that will leave readers with something to consider.
Step-by-step explanation:
Every reader of literature already knows that an interpretation of piece of literature (especially a poem) is just one of many other possible interpretations. When we support one interpretation, our purpose is not eliminate alternative interpretations. We just want the reader to consider our interpretation as well. Hence, we need an evidence to convince the readers that they should consider that particular interpretation as well.
Option A is incorrect, because Robert's main purpose is not to fill two or three pages, but to convince reader of that interpretation.
Option B is incorrect because it is very absurd.
Option C is also incorrect, because Robert's purpose is not to prove that ONLY his interpretation is correct. His purpose is to add one more interpretation to some already existing interpretations.