D. Reduce pollution and conserve water usage to protect groundwater.
Reducing pollution and conserving water are essential steps to protect groundwater resources for future use. This approach ensures that the existing groundwater remains clean and available, and by using water more efficiently, we can help to maintain and restore the natural recharge processes, allowing aquifers to replenish over time. Building more dams and reservoirs (A) or digging deeper wells (B) can lead to further stress on groundwater resources. Completely stopping the use of groundwater (C) may not be practical or possible in many areas where it is a vital water source.
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