The correct answer is: c) Zone IV
Assam is located in a seismically active zone, which means that it is prone to earthquakes. The Indian Plate is moving northwards and colliding with the Eurasian Plate, which is causing the Himalayas to rise. This movement is also causing stress to build up along the fault lines in the region, which can eventually lead to earthquakes.
The seismicity of Assam is classified into five zones, with Zone V being the most active and Zone I being the least active. Zone IV is a moderately active zone, with a high probability of earthquakes of moderate magnitude.
The following table shows the seismicity zones in India and the corresponding probability of earthquakes:
| Zone | Probability of earthquakes |
|—|—|
| I | Very low |
| II | Low |
| III | Moderate |
| IV | High |
| V | Very high |
Assam is located in Zone IV, which means that there is a high probability of earthquakes of moderate magnitude. It is important to be aware of the seismicity of the region and to take precautions to protect yourself and your property in the event of an earthquake.