the ability to revolve around the central ball a magnet in each ball a representation of oceans on each ball a source of thermal energy
I gave my students this multiple choice question: Giselle makes a model, using foam balls, to represent the events in a solar eclipse. To demonstrate this phenomenon best, the foam ball model should have which characteristic?

Only one answer is correct among these 4 choices:
- the ability to revolve around the central ball
- a magnet in each ball
- a representation of oceans on each ball
- a source of thermal energy

Could you tell me which one is correct?

the ability to revolve around the central ball