They are made of the same materials. They orbit the Sun in opposite directions. They have the same orbital periods around the Sun. They are located on opposite sides of the asteroid belt.
I gave my students this multiple choice question: Mars is an inner planet and Jupiter is an outer planet. Which best describes the relationship between the two planets?

Only one answer is correct among these 4 choices:
- They are made of the same materials.
- They orbit the Sun in opposite directions.
- They have the same orbital periods around the Sun.
- They are located on opposite sides of the asteroid belt.

Could you tell me which one is correct?

They are located on opposite sides of the asteroid belt.