An Example of a Reaction Having an E_act = 0 $\rightarrow$

An example of a reaction having an E_act = 0 would be:

A) Br· + Br-Br $\rightarrow$ Br-Br + Br·
B) F· + CH₄ $\rightarrow$ H-F + CH₃·
C) CH₃· + CH₃CH₃ $\rightarrow$ CH₄ + CH₃CH₂·
D) Br· + H-Br $\rightarrow$ H-Br + Br·
E) CH₃· + CH₃· $\rightarrow$ CH₃-CH₃