The citizens of a town are aware of climate change, and they want to make changes to control it. one change they consider is replacing the nearby thermal power plant with a hydroelectric plant. if they want to make sure this change will to slow climate change, which question should they ask? a. is it less expensive to build a hydroelectric power plant than a thermal power plant? b. does a hydroelectric power plant employ fewer people than a thermal power plant? c. does a hydroelectric power plant emit less co2 than a thermal power plant? d. is the cost of operating a hydroelectric power plant less than the cost of running a thermal power plant?