The discussion centers on the calculation of Gibbs free energy using the equation ΔG = ΔG° + RTln(c_B/c_A), where c_A and c_B represent the concentrations of species A and B. The participant expresses confusion regarding the correct answer, which is indicated as option a in the key. They highlight that without specified units for the answers, multiple options could potentially be correct, particularly concerning the sign of the values. The conversation emphasizes the importance of clarity in unit specifications for accurate interpretation of Gibbs free energy calculations. Overall, the need for precise information in scientific questions is underscored.