only a physical change occurred. a chemical change occurred. only a loss of mass occurred. the formation of an element occurred.
I gave my students this multiple choice question: A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon dioxide provided evidence that

Only one answer is correct among these 4 choices:
- only a physical change occurred.
- a chemical change occurred.
- only a loss of mass occurred.
- the formation of an element occurred.

Could you tell me which one is correct?

a chemical change occurred.