Answer: b. the smell of methyl isocyanate
Explanation: The smell of methyl isocyanate outside of the walls of the Union Carbide Bhopal plant was as a result of the disaster that occurred on December 3, 1984, where more than 40 tons of methyl isocyanate gas was leaked from the pesticide plant. This immediately killing at least 3,800 people, causing significant morbidity and premature death thousands more. While the disaster indicated a need for enforceable international standards for environmental safety, the events in Bhopal revealed that expanding industrialization in developing countries such as India, without a simultaneous evolution in safety regulations could have catastrophic consequences.