When a substance freezes, its atoms become locked in place so they do not move from one position to another. therefore, any substance that is frozen is a plasma. gas. liquid. solid.

Any substance that is frozen is a Solid.

In solids, atoms do not really move because they are closely packed with one another giving it a proper shape.

In liquids, atoms and molecules move fast enough that they can overcome attractions of each other but partially.

In gas, atoms move really fast and they are able to overcome all the attraction around them and plasma is quite similar to gas.

Answer

Correct answer is solid

Expalnation

to explain this problem, it is necessary to know what is solid, liquid, gas and plasma

Gas

Gas is a substance whose molecules or atoms can expand freely to fill the whole container gas does not have fixed shape like solid and no fixed volume like liquid so a substance in its frozen state cannot be a gas.

Liquid

Liquid is a substance which is composed of molecules which can move freely among themselves but they cannot separate like molecule of gases. Liquid does not have fixed volume and shape. Therefore a substance in its frozen state cannot be a liquid.

Plasma

Plasma is  the fourth state of matter. It is a matter in which many of the electrons moves freely among the nuclei of the atoms. It does not have fixed shape. So a substance in its frozen state cannot be a plasma

solid

solid is a substance the atoms of which are closely packed. Atoms of solid cannot move freely like liquid and gas. Solid have fixed shape whether it is in a container or not. Therefore a substance in its frozen state is a solid because its atoms are locked and cannot move from one position to another like gas and liquid molecules.

if they have a finite resultant

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.