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At higher temperatures, molecules have higher kinetic energy, which causes them to move faster. This increased movement is a result of the thermal energy overcoming intermolecular forces, allowing molecules to vibrate, rotate, and translate more vigorously. This effect is observed in nearly all states of matter; for instance, in gases, particles move rapidly and freely; in liquids, they flow more easily; and even in solids, the increased heat can allow for greater vibrational movement of the particles.

The other options do not accurately represent the behavior of molecules at higher temperatures. For example, density typically decreases as temperatures rise because substances tend to expand when heated, leading to lower density. Moreover, faster molecular motion contradicts the idea of slower movement, and increased thermal energy does not facilitate quick freezing; instead, it usually prevents it as energy is required for a phase change from liquid to solid. Therefore, the statement about molecules moving faster at higher temperatures is correct and fundamental in understanding molecular behavior in thermodynamics.