10. Mario is making chocolate. In part of the chocolate-making process, he changed the phase from a liquid to a solid. What happened to the molecules of chocolate when it changed phase?

a
Before changing phase, the molecules were moving around each other. After changing phase, they were moving away from each other.

b
Before changing phase, the molecules were moving around each other. After changing phase, they were moving in place.

c
Before the changing phase, the molecules were moving away from each other. After changing the phase, they were moving around each other.

d
Before changing phase, the molecules were moving in place. After changing phase, they were moving around each other.