Melting point of a substance is $$10^\circ\text{C}$$. What does this mean?

A

The substance is a liquid at $$10^\circ\text{C}$$.

B

The substance is a solid at $$10^\circ\text{C}$$.

C

There is an equilibrium between solid phase and liquid phase at $$10^\circ\text{C}$$.

D

The substance is 50 percent solid and 50 percent liquid at $$10^\circ\text{C}$$.