Now most of the disposable plastic cans are labeled with the type or quality of the plastic (from 1 to 9). The plastic with the lowest number is the easiest to be recycled by the recycling factory. Plastic is rarely recycled. As a result, consumers can significantly reduce non-recyclable waste in the long run by refusing to buy products that are packaged in the highest numbered plastic products. Which of the following items, if correct, can most seriously weaken the above conclusions. ['Currently, the cost of collecting, sorting, and recycling discarded plastic waste is higher than new plastic products made from raw materials.', "Many consumers don't notice the numbers printed on plastic containers.", 'After recycling of plastic containers, the number is almost always on the rise, because recycling will reduce the quality of plastic products.', 'Communities that collect all discarded plastic containers for recycling in the future only dump higher-numbered plastics into garbage dumps when there is clearly no recycler to recycle them.']