The standard enthalpy of the decomposition of `N_(2)O_(4)` to `NO_(2)` is 58.04 kJ and standard entropy of this reaction is 176.7 `J//k`. The standard free energy change for this reaction at `25^(@)C` is
A. 539 kJ
B. `-539 kJ`
C. `-5.39 kJ`
D. `5.39 kJ`