Explanation:

- Disaster: An event causing significant damage or distress. Typically involves sudden, harmful occurrences.

- Safety: A state of being safe; Freedom from risk or danger. Not a direct opposite of disaster but rather a condition of its absence.

- Downfall: A sudden loss of power or failure. Related to decline but not focused on catastrophic events.

- Collapse: A sudden failure or breakdown. Similar in some contexts to disaster, but more about structural failure.

- Success: Achieving a favorable or desired outcome. The opposite of a negative event like a disaster.

- Correct Answer: Success

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