(C) Ultraviolet $(UV)$ radiations from the sun act on molecular oxygen $(O_2)$ in the upper atmosphere (stratosphere).These radiations split the $O_2$

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(C) Ultraviolet $(UV)$ radiations from the sun act on molecular oxygen $(O_2)$ in the upper atmosphere (stratosphere).These radiations split the $O_2$ molecules into free oxygen atoms $(O + O)$.These free oxygen atoms then combine with molecular oxygen $(O_2)$ to form ozone $(O_3)$ through the reaction: $O_2 + O \rightarrow O_3$.