It rotates on its axis. It lacks liquid water. It orbits a nearby planet. It reflects light from a star.
I gave my students this multiple choice question: A large, solid spherical body in the solar system is classified as a moon. Which characteristic of the body gives it this classification?

Only one answer is correct among these 4 choices:
- It rotates on its axis.
- It lacks liquid water.
- It orbits a nearby planet.
- It reflects light from a star.

Could you tell me which one is correct?

It orbits a nearby planet.