C˙l+CH4→A+B\mathrm{\dot Cl+CH_4\rightarrow A+B}C˙l+CH4→A+B
A and B in the above atmospheric reaction step are :
Official answer: C
Hydrogen abstraction. Cl∙+CH4→CH3∙+HCl\mathrm{Cl^\bullet+CH_4\rightarrow CH_3^\bullet+HCl}Cl∙+CH4→CH3∙+HCl.
(C)