In the Reaction of Cl₂ with Ethane and UV Light

In the reaction of Cl₂ with ethane and UV light, which of the following reactions would be a propagation event(s) ?
I. Cl∙ + CH₃-CH₃ → CH₃-CH₂-Cl + H∙
II. Cl∙ + CH₃-CH₃ → CH₃-H₂C∙ + HCl
III. Cl∙ + CH₃-H₂C∙ → CH₃-CH₂-Cl
IV. Cl₂ + CH₃-H₂C∙ → CH₃-CH₂-Cl + Cl∙
V. Cl_{2 + UV light} → C l∙ + Cl∙

A) reactions I and V
B) reactions II, III and IV
C) reactions I and IV
D) reactions II and IV
E) reactions I, II and IV