36. The author's assertion that "detecting meaningful differences in these qualities between competently designed typefaces is remarkably difficult" functions in the argument primarily to(A) demonstrate that the State Department made an irrational decision based on personal bias(B) establish that the debate over the font change cannot be resolved on purely technical grounds(C) prove that Calibri and Times New Roman are interchangeable in all professional contexts(D) discredit previous research studies on the relative merits of serif and sans-serif fonts