A Chemical System Is Considered to Have Reached Equilibrium When

A chemical system is considered to have reached equilibrium when

A) the rate of consumption of each of the product species by the reverse reaction is equal to the rate of production of each of the reactant species by the reverse reaction.
B) the sum of the concentrations of each of the reactant species is equal to the sum of the concentrations of each of the product species.
C) the rate of production of each of the product species is equal to the rate of consumption of each of the product species by the reverse reaction.
D) the rate of production of each of the product species is equal to the rate of consumption of each of the reactant species by the reverse reaction.
E) the rate of production of each of the product species by the forward reaction is equal to the rate of production of each of the reactant species by the reverse reaction.