In most industrial waste products that contain the toxic chemical XTX, the concentration of this chemical is approximately 1, 000 parts per million. A federal law intended to reduce the harm that can result from the introduction of XTX into the environment permits a company to dispose of these waste products in a dump for hazardous waste, but only if the concentration of XTX is below 500 parts per million. Waste products with concentrations above that level must be destroyed by incineration. The law further specifies that manufacturers may not dilute XTX-containing waste products to bring their concentration of XTX down to a permissible level for dumping. Which one of the following, if true, argues most strongly for the inclusion of the antidilution provision of the law? ['Most owners of dumps for hazardous waste are willing to accept XTX for disposal in their facilities only in concentrations below 800 parts per million.', 'If present in the environment in sufficient quantities, the diluted XTX is as harmful as the more concentrated XTX.', 'If improperly incinerated, waste products containing undiluted concentrations of XTX can release into the environment a gaseous form of the chemical that is more than twice as toxic as XTX is in its usual liquid state.', 'To manufacturers, the cost of diluting and disposing of waste products containing XTX is approximately the same as the cost of destroying these products by incineration.']