The correct answer is (c). The Himalaya and North Eastern Hill area is the most landslide prone zone in India. This is because the region is characterized by steep slopes, high rainfall, and loose soil. These factors make the region susceptible to landslides, which can cause significant damage to property and infrastructure, and loss of life.
The Ganga Valley Region is a relatively flat region with low rainfall. The South Indian Plateau is also a relatively flat region, but it has a higher rainfall than the Ganga Valley Region. Both of these regions are less prone to landslides than the Himalaya and North Eastern Hill area.
The answer (d), None of the above, is incorrect because the Himalaya and North Eastern Hill area is the most landslide prone zone in India.