In the following sequence of the reactions, what is D?

${\mathrm{PhCH}}_3\stackrel{\left(\mathrm{O}\right)}{\to }\mathrm{A}\stackrel{{\mathrm{SOCl}}_2}{\to }\mathrm{B}\stackrel{{\mathrm{NaN}}_3}{\to }\mathrm{C}+$ heat $\to \mathrm{D}$

D is phenyl isocyanate. Following are the reactions that take place during the conversion of ${\mathrm{PhCH}}_3$ to phenyl isocyanate.

Hence, the correct answer is option C) Phenyl isocyanate.