What happened in Chernobyl, Ukraine, in 1986?
A.
The explosion of a nuclear reactor killed 30 people.
B.
Deadly gases from a pesticide factory killed 20,000 people.
C.
The dam holding back a toxic waste retention pond failed, flooding 10,000 homes with benzene.
D.
Uranium seeping out of a mine contaminated the water supply, causing radioactive poisoning in 30% of the city’s residents.
Please select the best answer from the choices provided.