A Reaction Is at Equilibrium at a Given Temperature and Constant

A reaction is at equilibrium at a given temperature and constant pressure when ________

A) ( $\Delta$ S_rxn = 0.)
B) ( $\Delta$ S $\begin{array} { l } \circ\\\mathrm { rxn }\end{array}$ = 0)
C) ( $\Delta$ G_rxn = 0.)
D) ( $\Delta$ G $\begin{array} { l } \circ\\\mathrm { rxn }\end{array}$ = 0) )
E) ( $\Delta$ H_rxn = 0.)