Which BEST describes a cause of the disaster at Chernobyl?

1. Nuclear fallout: the settling of radioactive particles released into the atmosphere after a nuclear explosion

2. Accident: an event that happens suddenly and by chance, without an apparent or controllable cause, typically resulting in damage or injury

3. Negligence: failure to use proper care; done with insufficient attention; action or judgment that is misguided or wrong; or lack of skill in the
management of property that causes injury or harm

4. Natural disaster: a major adverse event resulting from natural occurrences such as floods, hurricanes, tornadoes, volcanic eruptions,
earthquakes, tsunamis, or other events created by nature that cause damage or loss of life