If the geographical condition of an area is “water stressed,” what is a preferred public policy for that area?

A、Build good roads, rail to the port; maintain relations with coastal neighbors, etc.
B、Scale up public health interventions to control climate-related diseases.
C、Examine and develop alternative options for domestic energy sources, such as geothermal, hydro, wind and solar power; emphasize energy efficiency.
D、Emphasize irrigation, specialize in crops that do not require huge amounts of water.