The correct option is B If assertion is true but reason is false
Correct option: (c) If assertion is true and reason is false.
Rainwater harvesting is storing rainwater for future use by making special harvesting structures. It is the traditional method. Water harvesting systems also include some modernized technologies to store water such as dams, tanks, etc.
The traditional water harvesting structures are khadins, bandhis, ahars-pynes and Kattas.
However, these structures are coming back in demand as these structures help in efficient catchment of rainwater and recharging groundwater.