mixing salt and pepper melting butter stirring salt into water melting an ice cube
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Louisa needs to demonstrate a solution to her class. Which is the best example of a solution?
Possibilities:
- mixing salt and pepper
- melting butter
- stirring salt into water
- melting an ice cube

stirring salt into water