To expand \( \frac{1}{3} (q - 6) \) using the Distributive Property, you multiply \( \frac{1}{3} \) by each term inside the parentheses:
\[ \frac{1}{3} \cdot q - \frac{1}{3} \cdot 6 \]
This simplifies to:
\[ \frac{1}{3}q - 2 \]
So, the correct answer is:
C: \( \frac{1}{3}q - 2 \)