The sugar dissolved the salt. The salt and sugar changed color. The sugar and the salt were unchanged. The salt and sugar formed a new material.
I gave my students this multiple choice question: A student mixed salt and sugar. Which statement describes the physical properties of salt and sugar after they were mixed?

Only one answer is correct among these 4 choices:
- The sugar dissolved the salt.
- The salt and sugar changed color.
- The sugar and the salt were unchanged.
- The salt and sugar formed a new material.

Could you tell me which one is correct?

The sugar and the salt were unchanged.