20. For Gibbs energy, G, which of the following statement is wrong? (A). For a spontaneous process at constant temperature and pressure, the change in G is negative. (B). G is defined by the equation: G = H - TS. (C). Its fundamental thermodynamic relation is: dG = −SdT+PdV. (D). The chemical potential of a pure substance is equal to its molar Gibbs energy. (E). G is a state function.