Which is the best method for preparation of the $N$ -methyl ethanamide?

b Co-product is $HCl$ which is escaped out itself.

Question

A$CH_3COOH + CH_3 - NH_2 \to$
B$CH_3COCl + CH_3 - NH_2 \to$
C$\begin{array}{*{20}{c}}
{C{H_3} - C - O - C - C{H_3}} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}$ ${ + C{H_3}C{H_2}N{H_2} \to }$
D$\begin{array}{*{20}{c}}
{C{H_3} - C - N{H_3} + C{H_3} - F \to } \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

Difficult

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