17Which of the following is true? (A) An increase of pressure always leads to a boiling point elevation for all substances. (B) An increase of pressure always leads to a melting point depression for all substances. (C) The slope of the solid-liquid coexistence curve in the P-T phase diagram is positive if the solid is less dense than the liquid. (D) In the P-V phase diagram, the solid-liquid coexistence region is broader than the gas-liquid coexistence region. (E) In the P-T phase diagram the Clausius-Clapeyron equation can be used to show that the slope of the solid-gas coexistence curve must be less than the slope of the liquid-gas coexistence curve near the triple point.