Solid.
I have to write all this extra stuff to answer ur question on Brainly but that is the answer :)
Wouldn't it be water vapor? Don't quote me on this, but I think when water Molecules (H2O) heat up, they expand away from each other and become gas.
Answer:
The foaming in the elephant toothpaste demonstration means that a gas is produced. Production of a gas is a clue that a chemical reaction has occurred. The water vapor in the genie-in-a-bottle demonstration also shows the production of a gas.