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The number of stomata and epidermal cells in \( 1 \mathrm{~mm}^{2} \) leaf area of lower epidermis of the leaves of \( X, Y \) and \( Z \) plants are given below. Arrange the plants in decreasing order of their stomatal index.
\begin{tabular}{ccc}
\hline Plants & Numbers of stomata & Numbers of epidermal cell \\
\hline\( X \) & 30 & 150 \\
\hline\( Y \) & 60 & 240 \\
\hline\( Z \) & 90 & 400 \\
\hline
\end{tabular}
(A) \( X, Y \) and \( Z \)
(B) \( Y, Z \) and \( X \)
(C) \( Z, Y \) and \( X \)
(D) \( Y, X \) and \( Z \)
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