Floating magnets

This task is about magnets.
This is a diagram of a child's toy.
Each ring has a magnet inside, so ring 2 seems to "float" above ring 1.
magnet-rings-main-diagram.png
 

Question

a) Which of the following diagrams show how the toy could be made.
     (Select the answer/s you think are true)

    • floating-magnet-A.png

    • Floating-magnet-B.png

    • Floating-magnet-C.png

    • floating-magnet-D.png

    • floating-magnet-E.png

    • floating-magnet-F.png

Question 3Change answer

b)  Explain why the top ring "floats" above the bottom ring.