For an exergonic reaction at constant temperature, the reaction quotient Q gradually increases as the reaction proceeds toward equilibrium. Which of the following describes how the sign and magnitude of ΔG change during this process?
a) ΔG becomes more negative because the system continues to release energy.
b) ΔG remains constant and negative throughout the reaction.
c) ΔG remains negative but its magnitude decreases until it reaches zero at equilibrium.
d) ΔG becomes positive once Q exceeds K, yet the forward reaction continues until equilibrium is reached.