What is the change in oxidation number of carbon in the following reaction?
$$C{H}_4(g)+4C{l}_2(g)\to CC{l}_4(l)+4HCl(g)$$

1. A
   $+4$ to $+4$
2. B
   $0$ to $+4$
3. C
   $-4$ to $+4$
4. D
   $0$ to $-4$