Which of the following are the chain propagating steps in the free radical chlorination of methane? I. Cl_2 rightarrow 2 CI II. Cl_2 + H rightarrow 2HC + CI III. CH_4 +CI. rightarrow CH_3 + HCl IV. CH_4 H. rightarrow CH_3 + H_2 V. CH+_3 Cl_2 rightarrow CH_3 Cl + cl. VI. CH_3 + Cl. Rightarrow CH_3Cl A) I and III B) II and VI C) III and IV D) III and V