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$CaO+D_2O\rightarrow Ca(OD)_2\downarrow$

$\begin{array}{1 1}(a)\;Calcium\;oxide\\(b)\;Calcium\;dentetraoxide\\(c)\;Calcium\;denpentoxide\\(d)\;Calcium\;denteroxide\end{array}$

Calcium denteroxide
Hence (d) is the correct answer.