When a liquid freezes into a solid, the particles of the substance: A. Lose energy
B. Gain energy
C. Move faster
D. Disappear

(see below)

Explanation:

Using process of elimination:

A) lose energy

When a liquid freezes into a solid, the particles move a lot slower because the once-flowing particles are now about to be stuck in place, barely vibrating in its structure.

So, yes, they has lost energy, but there can be a better answer.

B) gain energy

When a liquid freezes into a solid, the particles move a lot slower, so there is no way there is more energy now. If there was to be more energy, it would be a gas now.

So, no, they did not gain energy.

C) move faster

When a liquid freezes into a solid, the particles move a lot slower, so there is no way they're moving faster now. Otherwise it would be a gas now.

So, no, they did not move faster.

D) disappear

Particles of a substance don't just . . . disappear. There is no way matter can be destroyed or created, only changed in form, according to the Conservation of Matter.

So, no, they did not disappear.

So the answer is most likely A.