Paragraph excerpt from an LSAT-style argumentative essay: "A workable policy should be judged by how it functions in ordinary cases. On the issue of whether a city should let residents vote on a small participatory-budgeting fund, the key point is that the example should show civic learning and limited spending authority rather than romanticizing direct democracy. [Example needed.] The example should clarify the reasoning, not replace it." Which sentence should replace [Example needed]?