9 . Arrange the odd positive integers $1,3,5,7, \cdots$ in five columns, as shown in the table below. The leftmost column is called the 1st column, and the columns are numbered from left to right. Thus, the number “1985” appears in
(A) the 1st column;
(B) the 2nd column;
(C) the 3rd column;
(D) the 4th column;
(E) the 5th column.
\begin{tabular}{|ccccc|}
\hline & 1 & 3 & 5 & 7 \\
15 & 13 & 11 & 9 & \\
& 17 & 19 & 21 & 23 \\
31 & 29 & 27 & 25 & \\
& 33 & 35 & 37 & 39 \\
47 & 15 & 43 & 41 & \\
& 19 & 51 & 53 & 55 \\
$\cdot$ & $\cdot$ & $\cdot$ & $\cdot$ & \\
& $\cdot$ & $\cdot$ & $\cdot$ & $\cdot$ \\
\hline
\end{tabular}
9. Observing that the numbers in the 1st column can all be expressed as $16n-1$ $(n=1,2, \cdots)$, and the first number below each number $16n-1$ is $16n+1$. Numbers of the form $16n+1$ are all in the 2nd column. Since $1985=16 \times 124+1$, 1985 is in the 2nd column.
(B) True.