Use tweezers to separate them. Use a magnet to separate them. Add water to the mixture. Pour the mixture into a filter.
I gave my students this multiple choice question: Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?

Only one answer is correct among these 4 choices:
- Use tweezers to separate them.
- Use a magnet to separate them.
- Add water to the mixture.
- Pour the mixture into a filter.

Could you tell me which one is correct?

Use a magnet to separate them.