Which of the following statements is true of the critical temperature of a pure substance?

AThe critical temperature is the temperature above which the liquid phase of a pure substance can exist.

BThe critical temperature is the temperature above which the liquid phase of a pure substance cannot exist.

CThe critical temperature is the temperature below which the liquid phase of a pure substance cannot exist.

DThe critical temperature is the temperature at which all three phases can coexist.

EThe critical temperature is the temperature at which the pure substance reaches, but cannot go beyond, the critical pressure.

Can someone explain this one?