Arunachal Pradesh falls within a seismically active zone, making it prone to:

The correct answer is: a) Landslides.

Arunachal Pradesh falls within a seismically active zone, making it prone to landslides. Landslides are a major natural hazard in the state, and they can cause significant damage to infrastructure and loss of life. The state government has taken steps to mitigate the

Tsunamis are not a major threat to Arunachal Pradesh, as the state is not located on the coast. However, the state is located near the Himalayas, which are a major earthquake zone. Earthquakes in the Himalayas can trigger landslides, which can then cause tsunamis.

Volcanic eruptions are also not a major threat to Arunachal Pradesh. The state is not located near any active volcanoes. However, there are some dormant volcanoes in the state, and there is a small risk that they could erupt in the future.

Heatwaves are not a major threat to Arunachal Pradesh. The state has a temperate climate, and temperatures rarely reach extreme levels. However, there is a small risk of heatwaves in the future, as the climate changes.

In conclusion, the correct answer is: a) Landslides.