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

Multiple Choice

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

A) $\left\{\frac{-1 \pm \sqrt{35}}{2}\right\}$

B) $\left\{\frac{-1 \pm \sqrt{35} \mathrm{i}}{2}\right\}$

C) $\left\{\frac{1 \pm \sqrt{35}}{2}\right\}$

D) $\left\{\frac{1 \pm \sqrt{35} i}{2}\right\}$