Farmers' wells would most likely take the longest to run out of water in:
A. areas on either side of the Rocky Mountains
The Rocky Mountains are known to have significant water runoff from snowmelt, and areas surrounding them, particularly on the western side, often benefit from perennial rivers and aquifers that can provide a sustainable source of groundwater. Additionally, areas in the vicinity of the Rocky Mountains typically have larger watersheds, which can contribute to groundwater recharge. Other mountain ranges may have less consistent water availability, making it likely that the watersheds around the Rockies would sustain groundwater for a longer duration.