Among the following compounds, which one will react with acetone to give a product that contains carbon-nitrogen double bond?

Consider the following intramolecular aldol condensation reaction.

$\mathrm{X}$ can be :

$$\begin{gathered} \underset{|}{\mathrm{C}}{\mathrm{H}}_2-{\mathrm{CONH}}_2 \\ {\mathrm{CH}}_2-{\mathrm{CONH}}_2 \underset{∆}{\overset{{\mathrm{P}}_2{\mathrm{O}}_5}{\to }}\left(\mathrm{P}\right)\underset{∆}{\overset{{\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\to }}\left(\mathrm{Q}\right) \end{gathered}$$

The product $\left(\mathrm{Q}\right)$ is