This natural disaster, which can happen due to volcanic or earthquake activity, has caused more deaths than lava flows. tsunami landslides or mudslides liquefaction fires

The correct answer is: landslides or mudslides.

Lava Flows are actually not that dangerous:  Lava is very often slow and could even be outrun - so not too many people die due to lava flows.

On the other hand, landslides and mudslides are very catastrophic and can wipe entire villages.

The bottom part thats where most farming goes on