- Option 1 is not correct, constructing concrete tanks and canals cannot improve the underground water level which will make water availability throughout the year impossible.
- Option 2 is not correct, the passage doesn't talk about the relationship between the cropping patterns and farming practices.
- Option 3 is not correct, the interlinking of the rivers across the country cannot be a solution as there is no substantial evidence of this will make water available throughout the year
- Option 4 is the correct answer, buffer stocking of water through dams and recharging aquifers will help maintain the water availability during fewer water days and recharging aquifers will help in ground water availability also.