Fact 1: Melting is when solids are heated above their melting point. Fact 2: When melted or dissolved in water, the crystal lattice is destroyed and the ions move freely. Given the two facts above, what is when solids are heated and ions move freely?

Available options:
a). dissolving;
b). refreshing;
c). kinetic energy;
d). removing;
e). boiling;
f). barrel-shaped;
g). renewing;
h). unidirectional;
Answer:
a).