In terms of its tone and form, the passage is most appropriately described as _________.

The question asks about both tone and content. The tone of the passage is neutral; the author summarizes facts, cites a statistic, and does not use charged or emotional diction. The content, however, is not disinterested; the author definitely advocates changes -- medical schools should not "wait passively" for society to change but should do more to address the problems of "current students." The correct answer is the choice that best fits this combination of a quiet, persuasive tone and clear-cut advocacy.