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If a random variable \( X \) has the following probability distribution:
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}
\hline\( X: \) & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\
\hline\( P(X): \) & \( a \) & \( 3 a \) & \( 5 a \) & \( 7 a \) & \( 9 a \) & \( 11 a \) & \( 13 a \) & \( 15 a \) & \( 17 a \) \\
\hline
\end{tabular}
then the value of \( a \) is
(A) \( \frac{7}{81} \)
(B) \( \frac{5}{81} \)
(C) \( \frac{2}{81} \)
(D) \( \frac{1}{81} \)
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