This map shows the amount of groundwater (GW) in parts of Pakistan. Farmers in Pakistan once relied on rivers and canals for their water supply, but as cities expanded and populations grew, more farmers used groundwater for their crops. When this map was made, there were no laws restricting how many wells could be built in Pakistan to remove groundwater. What would be the best solution to help Pakistan conserve their water supply?

A.
Increase the number of groundwater wells in all three regions.
B.
Build more wells in region 3, and restrict building in all other regions.
C.
Pass laws restricting well building in region 1, but increase wells in regions 2 and 3.
D.
Pass laws restricting all wells, with the fewest restrictions in Region 1.