What Does a Negative Slope for the Solidus-Liquidus Line in a Phase

Multiple Choice

What does a negative slope for the solidus-liquidus line in a phase diagram indicate?

A) The solid phase is less dense than the liquid phase for that particular material.
B) The solid phase is more dense than the liquid phase for that particular material.
C) The liquid only turns to solid as the pressure is increased.
D) There is no correlation to states of matter based on the slope of the solidus-liquidus line of a phase diagram.