The correct answer is: d) All of the above
Deforestation, heavy rainfall, and steep slopes are all factors that contribute to landslides in Nagaland.
Deforestation removes trees, which help to hold soil in place. When trees are removed, the soil is more likely to erode and slide downhill.
Heavy rainfall can also cause landslides. When it rains heavily, the soil becomes saturated and can no longer support the weight of the trees and other vegetation. This can lead to landslides, especially on steep slopes.
Steep slopes are also more prone to landslides. The steeper the slope, the more likely it is that the soil will slide downhill.
In addition to these factors, other things that can contribute to landslides include earthquakes, volcanic activity, and human activities such as mining and construction.
Landslides can cause a lot of damage to property and infrastructure, and can also be deadly. It is important to be aware of the risks of landslides and to take steps to mitigate them.