Simplify the following expression.
$$\frac{x^{2} - 2x - 63}{x^{2} + 14x + 49}$$

A

$$\frac{x + 9}{x + 7}$$

B

$$\frac{x - 7}{x + 7}$$

C

$$\frac{x + 7}{x - 7}$$

D

$$\frac{x - 9}{x + 7}$$