Read the article, the storm-drain diagram, and the pollution counts. Article: "Litter dropped on uphill streets often washes through storm drains and into the creek after rain." Diagram: Street gutter -> storm drain -> underground pipe -> creek Pollution counts found near drains after a cleanup: School drain - 32 pieces Park drain - 14 pieces Hilltop drain - 27 pieces If the town can post only one anti-litter sign, where would it likely reduce the most creek pollution?