The conclusion that could they draw from this observation is that molecular motion increased. The correct option is D.
What is motion?
Motion is changing the position of an object when any force is applied to it. Motion means the object is moving. The motion of molecules means the molecules of an element are moving. This happens due to an increase in temperature.
Boiling is the term for the process of a liquid turning into a gas when heated to a constant temperature. The molecular motion is controlled by the kinetic energy of the molecules.
The kinetic energy of liquid molecules increases with heating. These molecules begin to move faster and farther apart. So the conclusion will be molecular motion.
Thus, the correct option is D. The molecular motion increased.
To learn more about molecular motion, refer to the link:
https://brainly.com/question/14240663
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