From what I know; When a sample of liquid water vaporizes into water vapor, the electrons in the water sped up due to heat.
sorry its quite messy haha
I believe the answer is B.


Compounds contain two or more different elements.
Water is a molecule because it contains molecular bonds . Water is also a compound because it is made from more than one kind of element. (oxygen and hydrogen).
So If you like, you can say that water is a molecular compound.
HOPE IT HELPED YOU.