breaks easily when struck with a hammer bubbles when acid is placed on it is easily scratched by a fingernail reflects light from its surface
I gave my students this multiple choice question: A chemical property of a mineral is evident if the mineral

Only one answer is correct among these 4 choices:
- breaks easily when struck with a hammer
- bubbles when acid is placed on it
- is easily scratched by a fingernail
- reflects light from its surface

Could you tell me which one is correct?

bubbles when acid is placed on it