Step 1: Start with the idea.
A hazard by itself does not make a disaster; a disaster happens when a community cannot cope with the hazard's impact.
Step 2: Write the relation.
\[ \text{Disaster} = \frac{\text{Hazard} \times \text{Vulnerability}}{\text{Capacity}} \]
Step 3: Read the parts.
A hazard is the threat, vulnerability is how exposed and weak the people are, and capacity is their ability to cope.
Step 4: See what raises the risk.
The damage is large when the hazard and vulnerability are high and the coping capacity is low (insufficient).
Step 5: Match the option.
So a disaster results from the combination of hazard, vulnerability and insufficient capacity.
Step 6: Conclude.
The correct choice names all three factors.
\[ \boxed{\text{Combination of hazard, vulnerability and insufficient capacity}} \]