For a reaction,$A \rightarrow B$,the average energies of $A$ and $B$ are $30 \ kcal/mol$ and $60 \ kcal/mol$ respectively. The energy of activation for the backward reaction is $93 \ kcal/mol$. The energy of activation for the forward reaction is:
- A$30 \ kcal/mol$
- B$123 \ kcal/mol$
- C$153 \ kcal/mol$
- D$90 \ kcal/mol$
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