A Chemist Is Planning to Study a Chemical Equilibrium for Which

A chemist is planning to study a chemical equilibrium for which no measured explicit thermodynamic values are available. However, the reaction involves common chemical species. What information could a chemist use to make predictions about the equilibrium?

A) equilibrium constants for the equilibrium reactions that can be combined to make the new equilibrium
B) " $\Delta$ G " values for the reactants and products of the new reaction
C) " $\Delta$ H_f" and S° values for the reactants and products of the new reaction
D) all the above