Consider the following sequence of reactions: ${\mathrm{CH}}_3\mathrm{Br}\stackrel{\mathrm{KCN}}{\to }\mathrm{A}\underset{\mathrm{\Delta }}{\overset{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }}\mathrm{B}\underset{\mathrm{ether}}{\overset{{\mathrm{LiAlH}}_4}{\to }}\mathrm{C}$

The end of product ‘C’ is