$X$ reacts with aqueous $NaOH$ to form $Y$ and releases $H_2$ gas. When the aqueous solution of $Y$ is heated at $323 \ K - 333 \ K$ and $CO_2$ gas is passed through it,it yields $Al_2O_3 \cdot xH_2O$ (often represented as $Al(OH)_3$) and $Z$. Heating $Z$ at $1200 \ ^\circ C$ gives $Al_2O_3$. Identify $X, Y,$ and $Z$.

• A
  $Al, AlCl_3, NaAlO_2$
• B
  $Zn, Na_2ZnO_2, Al(OH)_3$
• C
  $Al, Al(OH)_3, AlCl_3$
• D
  $Al, NaAlO_2, Al(OH)_3$