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A. Higher............

The higher the temperature of an object the faster the molecules vibrate.  

Kinetic energy is the energy of the motion, which is equivalent to thermal energy at the smallest scale, that is, heating up and kinetic energy are considered as similar thing.  

• With vibrations, the molecules bump into each other, thus, transferring kinetic energy to other molecules that at certain occasions radiate this energy as heat.  

• When the environment in which molecules prevails gets heated, the absorption of kinetic energy takes place by the molecules and thus more vibrations takes place.  

Thus, it can be said that when the temperature of an object is higher the faster the molecules will vibrate.

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