Identify the relation between the standard Gibbs free energy change $\Delta G^{\circ}$ and the equilibrium constant $K_c$ for a chemical reaction.
- A$\Delta G^{\circ} = RT \ln K_c$
- B$-\Delta G^{\circ} = \frac{RT}{\ln K_c}$
- C$\Delta G^{\circ} = \frac{\ln K_c}{RT}$
- D$-\Delta G^{\circ} = RT \ln K_c$
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