Correct option is B
Volcanoes and Cyclones are natural hazards that occur due to natural reasons alone. Forest fires and Floods, although they can be natural, are often influenced by human activities such as deforestation and poor land management, which makes A and D partially influenced by anthropogenic factors.
Information Booster:
1. Volcanoes are caused by tectonic movements and magma flow.
2. Cyclones result from atmospheric disturbances and oceanic factors.
3. Forest fires can be naturally occurring due to lightning, but human actions often contribute significantly.
4. Floods can be natural but are exacerbated by poor urban planning and deforestation.