According to the Phase Diagram Given, Which of the Following

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

A) At the temperature and pressure of point 1, substance U exists as a three-phase equilibrium system.
B) At the temperature and pressure of point 2, substance U exists as a one-phase gaseous system.
C) At the temperature and pressure of point 3, substance U exists as a two-phase system.
D) If the U(s) ⇔ U(l) system is maintained at the temperature of point 4 while pressure is decreased steadily to about 300 torr, more U will freeze.
E) There are no conditions of temperature and pressure under which solid U will vaporize without melting first.