Discussion
Landslides hazards are common in the hilly regions due to :
Answer: D
Landslides in hilly regions are due to all of the above.
Loss of vegetation removes the roots that bind the soil and the cover that slows rainwater, so slopes become unstable. Loss of soil through erosion weakens the slope further. Cutting of hill slopes for roads, buildings and mining makes slopes steeper and removes their support at the toe.
Each of the three is a recognised cause, and heavy rain often triggers a slope already weakened by them. Choosing any single one leaves out the other two, so the inclusive option is correct.
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