Answer:
Option D is correct.
Explanation:
Landslide is a kind of a mass waste of the earth and the main cause is the excess of water which reduces the friction of the earth material with the surface and it results in the Landslide.
Another reason for the landslide is an earthquake which generates movement with the ground layers and it results in Landslide.
To rescue from the landslide we should make the surface more and more water protective so that water could not contact the inner layer of the earth surface.