Please explain.

The average bond enthalpy for the C-H bond is 412 kJ mol^-1. Which process has an enthalpy change closest to this value ?

A. CH 4 (g)---> C(s)+2H2(g)
B. CH 4(g)--> C(g)+2H2(g)
C. CH 4(g)---> C(s)+ 4H(g)
D. CH 4 (g)---> CH3(g)+ H(g)

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Please explain.The average bond enthalpy for the C-H bond is 412 kJ mol^-1. Which process has an enthalpy change closest to this
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