For which project would a government leader most likely use a cost-benefit analysis?

building a new police station or fire station
building a new hospital closer to a city
building a new school with granite or limestone
building a water-filtration plant near a reservoir

the answer is: building a water-filtration plant near a reservoir

Cost-benefit analysis was being done to make sure that the benefit that can be acquired from a certain project would outweigh the total expense needed to make that project happen.

projects that have really high cost and would affect largest number of people tend to be the one that most-likely used cost-benefit analysis. From the options , building a water-filtration plant near a reservoir would fulfill both criteria.

polisit can also mean a body of citizens. in modern historiography, polis is normally used to indicate the ancient greek city-states, like classical athens and its contemporaries, and thus is often translated as "city-state". the body of citizens came to be the most important meaning of the term polis in ancient greece.