The correct option is A To decrease the flow of water and to ensure that the water has a greater chance of percolating into the ground.
In order to stem the flow of water, grass can be planted in the path of the water or we can even build small check dams across streams to slow the flow of water and to ensure that water has a greater chance of percolating into the ground, recharging the water table. Such efforts are known as watershed development projects.