Energy analyst: During this record-breaking heat wave, air conditioner use has overloaded the region' s electrical power grid, resulting in frequent power blackouts throughout the region. For this reason, residents have been asked to cut back voluntarily on air conditioner use in their homes. But even if this request is heeded, blackouts will probably occur unless the heat wave abates. Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above? ['Most air-conditioning in the region is used to cool businesses and factories.', 'Most air-conditioning systems could be made more energy efficient by implementing simple design modifications.', 'The heat wave is expected to abate in the near future.', 'Air-conditioning is not the only significant drain on the electrical system in the area.']