Answer:
B. A system of growing food without using much land.
Step-by-step explanation:
You have to prioritize more than just the day-to-day needs of a population--you also have to plan for the long-term survival of the people living there. Whenever human development and population in an environment begin to grow rapidly, the most important consideration must be sustainability of the population, and the best way to do that is by replacing the resources that are being used at a pace that is commensurate with their consumption. Finding new ways of growing food to meet the needs of a population in a growing city (where there isn't a surplus of land for farming) might include: growing fruits and vegetables on balconies, patios or windowsill containers.