$A$ compound $(M_2O_2)$ of group $I$ element $(M)$ hydrolyses to form $M^{+}$,$OH^{-}$ and $X$. Another compound $(M'O_2)$ of group $I$ element $(M')$ hydrolyses to form $(M')^{+}$,$OH^{-}$,$X$ and $Y$. What are $X$ and $Y$ respectively?

• A
  $H_2O_2, O_2$
• B
  $O_2, H_2$
• C
  $H_2O_2, O_3$
• D
  $H_2, H_2O_2$