Which of the Following Statements Best Describes an Example of a Reaction

Which of the following statements best describes an example of a reaction that may be at chemical equilibrium in a cell?

A) an exergonic reaction in which the free energy at equilibrium is higher than the energy content of the reaction at any point away from equilibrium
B) an exergonic reaction in which the entropy change in the cell is precisely balanced by an opposite entropy change in the cell's surroundings
C) a chemical reaction in which there is no change in the net concentrations of reactants or products at that time in the cell
D) an endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment