The correct answer is b). The potential energy of molecules decreases as they get closer to one another.
This is true because molecules are attracted to one another by intermolecular forces, which are weaker than chemical bonds. As molecules come closer together, the intermolecular forces increase in strength, and this increase in strength is greater than the decrease in potential energy.
Therefore, the total potential energy of the molecules decreases as they get closer together. This is in contrast to a and d, which are false. Increasing pressure on a solid does not usually cause it to become a liquid, and intermolecular forces are generally weaker than bonding forces.
In c, energy is not given off when the attraction between two molecules is broken, but instead when bonds are broken.
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