The correct option is D Deterioration of the quality of groundwater
Initially, irrigation in many regions was done using a Mota Bavi, which could only irrigate a few acres of land. As technology improved, power-driven pumps enabled farmers to irrigate larger areas of land, increasing water consumption. However, this consumption exceeded the rate of replenishment of groundwater. As a result, the groundwater levels depleted.
Additionally, the quality of the groundwater deteriorated due to the excess use of chemical pestisides and fertilisers.