The sum of the series $$^{20}C_0 - {}^{20}C_1 + {}^{20}C_2 - {}^{20}C_3 + \ldots - \ldots + {}^{20}C_{10}$$ is

A

$$-{}^{20}C_{10}$$

B

$$\frac{1}{2} {}^{20}C_{10}$$

C

0

D

$$^{20}C_{10}$$