To compare \( \frac{3}{9} \) and \( \frac{1}{3} \), we first simplify \( \frac{3}{9} \):
\[ \frac{3}{9} = \frac{1}{3} \]
Since \( \frac{3}{9} \) simplifies to \( \frac{1}{3} \), both fractions represent the same point on a number line.
Therefore, the correct answer is:
B. the same point