Phép tính

Câu hỏi: Phép tính $\frac{\text{2}}{\text{x}+\text{3}}-\frac{\text{3}}{{\text{x}}^{\text{2}}-\text{9}}$  có kết quả là?

A. $\frac{\text{2x}-\text{9}}{{\text{x}}^{\text{2}}-\text{9}}$

B. $\frac{\text{2x}-\text{3}}{{\text{x}}^{\text{2}}-\text{9}}$

C. $\frac{\text{2x}-\text{9}}{\text{x}-\text{3}}$

D. $\frac{\text{x}-\text{6}}{{\text{x}}^{\text{2}}-\text{9}}$