Asteroids are gaseous, and comets are solid. Asteroids are solid, and comets are gaseous. Both asteroids and comets are solids. Both asteroids and comets are gaseous.
I gave my students this multiple choice question: Which statement describes asteroids and comets?

Only one answer is correct among these 4 choices:
- Asteroids are gaseous, and comets are solid.
- Asteroids are solid, and comets are gaseous.
- Both asteroids and comets are solids.
- Both asteroids and comets are gaseous.

Could you tell me which one is correct?

Asteroids are solid, and comets are gaseous.