Which of the following actions is most similar to city-planning techniques developed by the aztecs? a. a police force opens new police stations in neighborhoods that have had consistently high crime rates. b. a city opens a new elementary school to serve a large immigrant population living on its outskirts. c. a university designs a new building to ensure that astronomers will be able to easily observe the night sky. d. a business relocates its headquarters outside a big city to avoid paying the city's high taxes.