Correct option is D
The natural outflow of groundwater at the Earth's surface does form a spring. Springs occur when the water table intersects the Earth's surface, allowing groundwater to flow out naturally.
An infiltration well is indeed a sub-surface source of water. It is designed to collect water from below the ground, typically from an aquifer.
Surface sources of water, such as rivers, lakes, and reservoirs, are often exposed to contaminants and typically require treatment before they can be used for drinking or other purposes.
Cavity Type Tube Well:
This is a special type of tube well in which water is not drawn through the sides but is drawn through the bottom of the well where a cavity is formed. Normally this type is used when a clay layer is met with. The zone of the flow in this case is spherical.
