Answer:
The correct answer is option A, water-table aquifers.
Step-by-step explanation:
Water-table aquifers are the most easily polluted water sources. A water-table aquifer is an underground layer of water-bearing rock or soil that is close to the surface of the Earth. These aquifers are the most easily polluted because they are located near the surface, where they are vulnerable to contamination from a variety of sources, such as agricultural runoff, industrial waste, and sewage. In contrast, confined aquifers, artesian wells, and hot springs are located deep underground and are less vulnerable to pollution. The correct answer is option A, water-table aquifers.