What happened in bhopal, india, in 1984? a. a nuclear reactor exploded, killing 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. an oil tanker crashed into a harbor dock, spilling 55,000 gallons of oil at the mouth of the ganges river.