Solve the Quadratic Equation Using the Most Efficient Technique (Factoring $6 x^{2}-3 x-9=0$

Multiple Choice

Solve the quadratic equation using the most efficient technique (factoring, extracting square roots, completing the square, or the quadratic formula) .
- $6 x^{2}-3 x-9=0$

A) $\left\{\frac{2}{3}, 1\right\}$

B) $\left\{\frac{2}{3}, 0\right\}$

C) $\left\{\frac{2}{3},-1\right\}$

D) $\left\{\frac{3}{2},-1\right\}$