The Difference in the Bond Energies of Reactants and the Transition

The difference in the bond energies of reactants and the transition state of a reaction is designated by the notation:

A) " $\Delta$ H ^$\circ$ "
B) " $\Delta$ H^‡"
C) " $\Delta$ G ^$\circ$ "
D) " $\Delta$ G^‡"
E) " $\Delta$ S^‡"