Question ID:PT3 S2 Q12 Passage:Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants. Stem:The conclusion of the argument is properly drawn if which one of the following is assumed? Correct Answer Choice:DChoice A:The cost of producing electric power at traditional plants has increased over the past 20 years. Choice B:Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. Choice C:None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. Choice D:Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 10 times the cost of producing power at traditional plants. Choice E:The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.