The coefficient of $$x^8$$ in $$\left(x - \frac{2}{x}\right)^{20}$$ is

A

$$^{20}C_{6}$$

B

$$^{20}C_{6} . 2^8$$

C

$$^{20}C_{6} . 2^6$$

D

$$^{20}C_{6} . 2^4$$