Identify $A$,$B$ and $C$ in the sequence: $CH_3CH_2Br$ $\xrightarrow[Alc.]{KCN} A$ $\xrightarrow{LiAlH_4} B$ $\xrightarrow[0^{\circ}C]{HNO_2} C$

The relation between $(A)$ and $(B)$ is:
$CH_3-CONH_2 \xrightarrow{KOBr} (A)$
$CH_3-CONH_2 \xrightarrow{LiAlH_4} (B)$

The reduction of benzenediazonium chloride to phenylhydrazine can be accomplished by:

The major product formed in the following reaction is:

Given below are two statements:
Statement $I$: Primary aliphatic amines react with $HNO_2$ to give unstable diazonium salts.
Statement $II$: Primary aromatic amines react with $HNO_2$ to form diazonium salts which are stable even above $300 \ K$.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which among the following reactions represents the Carbylamine reaction?