The reaction of sodium acetate with acetyl chloride proceeds through which of the following mechanisms?

The product $D$ of the reaction is:
$CH_3Cl$ $\xrightarrow{KCN} (A)$ $\xrightarrow{H_2O} (B)$ $\xrightarrow{NH_3} (C)$ $\xrightarrow{\Delta} (D)$

The final product $[D]$ of the reaction is
$CHCl_3$ $\xrightarrow[hv]{O_2} [A]$ $\xrightarrow{EtOH} [B]$ $\xrightarrow{2 \ mole \ MeMgBr} [C]$ $\xrightarrow{CaOCl_2} [D]$ $\xrightarrow{\Delta} CH_3-C(=O)-CH_3$

The reagent$(s)$ required for the following conversion are:

Statement $(A)$: Carboxylic acid can be obtained by the reaction of $R-C \equiv N$ with $H_3O^+$ under mild reaction conditions.
Statement $(B)$: Hydrolysis of $R-C \equiv N$ in alkaline aqueous medium gives $R-COONa$ and $NH_3$ as products.
The correct answer is:

The product $(A)$ of the reaction is: