a change of state. a chemical reaction. the creation of matter. the movement of electricity.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student drops a white tablet into a glass of water, producing carbon dioxide gas. This is a demonstration of
Possibilities:
- a change of state.
- a chemical reaction.
- the creation of matter.
- the movement of electricity.

a chemical reaction.