Ans: B
$\begin{array}{cl}
& 0.009~049~999 \\
= & 0.009 \mbox{ (correct to 3 decimal places)}
\end{array}$
$\begin{array}{cl}
& 0.009~049~999 \\
= & 0.009 \mbox{ (correct to 3 decimal places)}
\end{array}$
$\begin{array}{cl}
& 0.009~049~999 \\
= & 0.009~05 \mbox{ (correct to 3 sig. fig.)}
\end{array}$
$\begin{array}{cl}
& 0.009~049~999 \\
= & 0.009~050 \mbox{ (correct to 6 decimal places)}
\end{array}$
$\begin{array}{cl}
& 0.009~049~999 \\
= & 0.009~050~00 \mbox{ (correct to 6 sig. fig.)}
\end{array}$
