- A

- B

- ✓$\begin{array}{*{20}{c}}
{\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,} \\
{\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,} \\
{H - C - C{H_2} - C - H\,,\,\,\,\,\,}
\end{array}\,\,$ $CH_3-CHO$ - DNone

