The correct options are
A Water treatment plants should be setup so that the polluted water from the industries can be reused to stop the wastage of water.
C More trees should be grown to increase the underground water level.
The ponds, old step wells near villages and cities should be made deep enough so that maximum water can be stored.
More trees should be grown to increase the underground water level. The water treatment plants should be setup so that the polluted water from the industries could be reused to stop the wastage of water. Water should be used carefully.