Simplify the given expression.

$$\frac{a^{2} - b^{2} - 2bc - c^{2}}{a^{2} + b^{2} + 2ab - c^{2}}$$

A

$$\frac{a + b + c}{a - b - c}$$

B

$$\frac{a - b - c}{a + b - c}$$

C

$$\frac{a + b - c}{a - b - c}$$

D

$$\frac{a - b + c}{a + b - c}$$