Given the Phase Diagram Shown Below, Which of the Following

Given the phase diagram shown below, which of the following statements is false?

A) When heated at 1 atm, this substance will first melt and then boil.
B) When phase A is compressed at constant temperature at point X, no change is observed.
C) At some (constant) temperature, the gaseous substance can be compressed into a solid and then into a liquid in this order.
D) The solid has a higher density than the liquid.
E) None of these statements is false.