Which Statement Is True About Phase Diagrams

Multiple Choice

Which statement is true about phase diagrams?

A) The triple point pressure is always found below 1 atmosphere.
B) The slope of the liquid-solid phase boundary line is typically negative.
C) The triple point temperature is the lowest temperature where a liquid can exist.
D) The critical temperature is lower than the triple point temperature.
E) The critical temperature is lower than the normal boiling point.