Read a student's conclusion to her informational piece about banning the use of plastic bags in grocery stores. as more and more cities and then states ban plastic bags in grocery stores, people will be forced to change their habit of relying on them. which sentence should the student add to create the most effective conclusion? there should be a law to ban the use of these bags across the whole country, and soon. people in the united states were using 100 billion plastic bags a year, and the bags were piling up. it is better to use reusable canvas or vinyl bags, which are more economical and environmentally sound. plastic bags are generally used only once and then thrown away.