You are presented with the question "Magnetism can cause what to repel each other?" and the following answer choices: 
- electromagnetic energy
 - flow of electrons
 - Veins and arteries.
 - barnacles
 - solid, liquid, gas
 - an electron lens
 - real-world things
 - Electrical energy

Now knowing that magnetism can cause objects to repel each other and an object is a real-world thing, choose the best answer.


 

       real-world things  