For Which of the Following Gas-Phase Reactions Would the E_act $\Delta$

For which of the following gas-phase reactions would the E_act be equal to $\Delta$ H°?

A) Cl-Cl $\rightarrow$ 2Cl·
B) 2 Cl· $\rightarrow$ Cl-Cl
C) Cl· + CH₄ $\rightarrow$ CH₃· + H-Cl
D) CH₃· + CH₃· $\rightarrow$ CH₃-CH₃
E) CH₃· + Cl-Cl $\rightarrow$ CH₃-Cl + Cl·