The minimum depth in the soil where all the spaces are filled with water is called
Water table
The explanation for the correct option: (D) Water table:
The explanation for the incorrect options: (A) saturation level: It is the amount of water needed to completely fill up the spaces in the rocks and soil underground.
(B) Groundwater table: It is the same as the water table, though the term ‘water table’ is commonly used.
(C) Groundwater: The water that seeps into the ground and is available as underground water is called groundwater.
Therefore, the correct option is: (D) Water table.