\[ \begin{array}{l} \mathrm{X}+\mathrm{C}+\mathrm{Cl}_{2} \underset{\mathrm{k}}{\stackrel{\text ...
0\[
\begin{array}{l}
\mathrm{X}+\mathrm{C}+\mathrm{Cl}_{2} \underset{\mathrm{k}}{\stackrel{\text { hiph }}{\longrightarrow}} \longrightarrow \mathrm{Y}+\mathrm{CO} \\
\mathrm{Y}+2 \mathrm{H}_{2} \mathrm{OK} \rightarrow \mathrm{Z}+2 \mathrm{HCl}
\end{array}
\]
In the above reactions, compounds \( \mathrm{X} \) and \( \mathrm{Y} \) have a polymeric structure. Then the compounds \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) are respectively
(A) \( \mathrm{BeCl}_{2}, \mathrm{BeO}, \mathrm{Be}_{2} \mathrm{C} \)
(B) \( \mathrm{BeO}, \mathrm{BeCl}_{2}, \mathrm{Be}(\mathrm{OH})_{2} \)
(C) \( \mathrm{Be}(\mathrm{OH})_{2}, \mathrm{BeC}, \mathrm{BeCl}_{2} \)
(D) \( \mathrm{BeO}, \mathrm{Be}(\mathrm{OH})_{2}, \mathrm{BeCl}_{2} \)
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