Carbon Tetrachloride Reacts at High Temperatures with Oxygen to Produce $\rightleftharpoons$

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine.CCl₄(g) + ¹/₂O₂(g) $\rightleftharpoons$ COCl₂(g) + Cl₂(g) , K_c = 4.4 * 10⁹ at 1,000 K Calculate K_c for the reaction 2CCl₄(g) + O₂(g) $\rightleftharpoons$ 2COCl₂(g) + 2Cl₂(g) .

A) 4.4 * 10⁹
B) 8.8 * 10⁹
C) 1.9 * 10¹⁰
D) 1.9 * 10¹⁹
E) 2.3 * 10^-10