during which changes of state do atoms that cannot move past one another become free to move? vaporization…

Brief Explanations:

In a solid - state, atoms are closely packed and cannot move past one another. Melting is the process of changing from solid to liquid, where atoms gain more freedom to move. Sublimation is the process of changing directly from solid to gas, also allowing atoms to move freely. Vaporization (including boiling) is from liquid to gas but doesn't start from a state where atoms can't move past one another. Deposition is gas to solid and condensation is gas to liquid, which are opposite of the required process.

Answer:

C. sublimation and melting