The correct options are
B By fixing the leaking pipes and taps of water.
C By not wasting water during taking a bath.
D By making people aware to start taking action on conservation of water.
Conservation of water can be done in many direct and indirect ways. Direct ways can be stopping the overuse of water, reparing leaking taps and pipes. On the other hand, indirect measures can be planting trees, rainwater harvesting and raising awarenes among the people. But conservation cannot be done by merely thinking but actually working on your thoughts to make it a reality.