Aconfined aquifer is found in the unsaturated zone found between two impermeable layers the top layer of the saturated zone separated from the main groundwater

Option B, found between two impermeable layers

Explanation:

A confined aquifer is one that is covered on both the sides by rocky structures which are non-permeable or it can be a water bearing stratum covered by a rock strata. Since it is covered on both sides, the water contained in it exists under pressure. Therefore, when a well is dug into it, the water rises due to pressure force.

Hence, option B is correct.

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