In the following sequence of reactions $CH_3-Br \quad$$\underrightarrow {KCN} A\quad \underrightarrow{H_3 O} \quad B \underrightarrow{LiAlH_4} \quad C$

Question

$\begin{array}{1 1} acetone \\ methane \\ acetaldehyde \\ ethylalcohol \end{array}$