Flowing water making a rock smooth A carrot becoming soft when cooked Sugar mixed into tea making the tea sweet Butter changing into liquid in a warm pan
I gave my students this multiple choice question: Which is an example of melting?

Only one answer is correct among these 4 choices:
- Flowing water making a rock smooth
- A carrot becoming soft when cooked
- Sugar mixed into tea making the tea sweet
- Butter changing into liquid in a warm pan

Could you tell me which one is correct?

Butter changing into liquid in a warm pan