magnetic electrical ductility malleability
I gave my students this multiple choice question: A salvage yard contains a mixture of iron, glass, aluminum, and plastic. Which property of iron does the salvage yard take advantage of when separating the iron from the rest of the materials?

Only one answer is correct among these 4 choices:
- magnetic
- electrical
- ductility
- malleability

Could you tell me which one is correct?

magnetic