The end product ($\mathrm{Z}$) of the following reaction is

Consider the following ions:

The reactivities of these ions in azo-coupling reactions (under similar conditions) will be:

The correct set of the products obtained in the following reactions

$\mathrm{RCN}\stackrel{\mathrm{reduction}}{\to }\left(\mathrm{A}\right), \mathrm{RCN}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) {\mathrm{CH}}_3\mathrm{MgBr}}{\to }}\left(\mathrm{B}\right), \mathrm{RNC}\stackrel{\mathrm{hydrolysis}}{\to }\left(\mathrm{C}\right), {\mathrm{RNH}}_2\stackrel{{\mathrm{HNO}}_2}{\to }\left(\mathrm{D}\right)$

The answer is :