Concept:
In disaster management, a disaster is not caused by a hazard alone; it results when a community is unable to cope with the impact of that hazard.
Step 1:
The standard relationship is expressed as Disaster = Hazard \(\times\) Vulnerability \(/\) Capacity. A hazard becomes a disaster only when a vulnerable population is exposed to it and lacks the capacity to manage the consequences.
Step 2:
Thus a disaster requires three elements together: the hazard, the vulnerability of people and assets, and insufficient capacity to cope. Removing any one (for example, having enough capacity) prevents the hazard from turning into a disaster.
Answer: Option (1) — Combination of hazard, vulnerability and insufficient capacity.