The correct answer is (c). Nagaland experiences frequent seismic activity because it lies in a highly active seismic zone.
A stable tectonic zone is an area where tectonic plates are not moving and there is little or no seismic activity. A moderately active seismic zone is an area where tectonic plates are moving slowly and there is some seismic activity. A highly active seismic zone is an area where tectonic plates are moving quickly and there is a lot of seismic activity. A dormant volcanic zone is an area where there is no volcanic activity, but there is a possibility of future volcanic activity.
Nagaland is located in the eastern Himalayas, which is a highly active seismic zone. The Himalayas are a mountain range that was formed by the collision of the Indian and Eurasian tectonic plates. The collision of these plates is still ongoing, and it is this movement that causes the earthquakes that are experienced in Nagaland.
The earthquakes in Nagaland can be quite powerful. In 1957, an earthquake with a magnitude of 8.6 struck the region, causing widespread damage and loss of life. More recently, in 2015, an earthquake with a magnitude of 6.8 struck the region, killing at least 117 people and injuring hundreds more.
The earthquakes in Nagaland are a reminder of the power of nature and the importance of being prepared for natural disasters.