A
Irrigation of terraced crop fields
B
Lift irrigation of cereal crops
C
Long duration energy storage
D
Rainwater harvesting system
Correct answer: (c) Long duration energy storage
Explanation
- A
Irrigation of terraced crop fields
Terraced irrigation. Pumped storage is not that.
- B
Lift irrigation of cereal crops
Lift irrigation of cereals. Different pumps, different purpose.
- C
Long duration energy storage
Long-duration energy storage. Pump up when power is cheap; generate when it is scarce.
- D
Rainwater harvesting system
Rainwater harvesting. Not pumped-storage hydro.
Summary. Official key is (c). Pumped-storage hydropower moves water between two reservoirs to store electricity for hours to days — long-duration energy storage. It is not an irrigation or rainwater-harvesting scheme.