City council member: Demand for electricity has been increasing by 1. 5 percent a year, and there simply is no more space to build additional power plants to meet future demand increases. We must ttherefore begin to curtail usage, which is why I propose passing ordinances requiring energy-conservation measures in all city departments. The city council member's proposal assumes which of the following? ['Residential consumers are not responsible for the recent increases in demand for electricity.', 'Passing ordinances designed to curtail electricity usage will not have negative economic consequences for the city.', 'City departments that successfully conserve energy will set a good example for residential and industrial consumers of electricity.', 'Existing power plants do not have the capacity to handle all of the projected increase in demand for electricity.']