According to the Phase Diagram Given, Which of the Following

Multiple Choice

According to the phase diagram given, which of the following statements is INCORRECT?

A) At the temperature and pressure of point 2, substance Z exists as a three-phase equilibrium system.
B) At the temperature and pressure of point 3, substance Z exists as a one-phase gaseous system.
C) If the Z(s) = Z(l) = Z(g) system is maintained at the temperature of point 2 while pressure is decreased, more Z will vaporize.
D) If liquid Z is maintained at the pressure of point 4 while the temperature is decreased to 30°C, the liquid will vaporize.
E) The existence of liquid Z at -50°C and 2 atm represents the metastable condition of "supercooling."