The correct option is C CH3−N=C=O
On December 3, 1984, a pesticide plant run by the subsidiary of Union Carbide leaked about 40 tons of deadly methyl isocyanate gas into the air in Bhopal, central India, quickly killing about 4,000 people. The lingering effects of the poison raised the death toll to about 15,000 over the next few years.
Methyl isocyanate: CH3−N=C=O