When released into the atmosphere, the refrigerant Freon damages the Earth' s ozone layer. A new kind of refrigerant does not have this effect. The manufacturer claims that replacing Freon with the new refrigerant in both new and existing refrigerators will prevent any further Freon damage to the ozone layer apart from that being done by the Freon already in the atmosphere. Which of the following must be true if the manufacturer's prediction is to prove accurate? ["The new refrigerant can counteract the damaging effects of Freon on the Earth's atmosphere.", 'The damage already done to the ozone layer is not of environmentally significant proportions.', 'The new refrigerant causes no environmental damage of any kind when it is released into the atmosphere.', 'Freon can be replaced with the new refrigerant without releasing any Freon into the atmosphere.']