A. Border flooding
B. Sprinkler irrigation
C. Drip irrigation
D. Free flooding

Ans : (C) Drip irrigation

Explanation :-
Drip Irrigation Method– Drip irrigation, also called trickle irrigation is the latest field irrigation technique and is meant for adoption at places where there exists acute scarcity of irrigation water and other salt problems. In this method, water is slowly and directly applied to the root zone of plants, thereby minimizing the losses by evaporation and percolation.