Assuming That, Since the Physical States Do Not Change, the Values

Assuming that, since the physical states do not change, the values of ?H and sS do not change as we raise the temperature in the reaction below. Using the following values at 298 K,
CdO(s) , $\Delta$ H°_f = -258.2 kJ mol^-1, S° = +54.8 J mol^-1 K^-1
CdSO₄(s) , $\Delta$ H°_f = -933.5 kJ mol^-1, S° = +123 J mol^-1 K^?1
SO₃(g) , $\Delta$ H°_f = -396 kJ mol^-1, S° = +256 J mol^-1 K^-1
Calculate a value for the free energy change, $\Delta$ G°_T for the reaction,CdSO₄(s) $\rarr$ CdO(s) + SO₃(g) at 750 K

A) +223.3 kJ mol^-1
B) +138.5 kJ mol^-1
C) -140.6 kJ mol^-1
D) +420.5 kJ mol^-1
E) -420.5 kJ mol^-1