Question

what do comets and asteroids have in common?
they are made of ice
they orbit the sun
they are made of metal debris
they are at the center of the solar system.

Explanation:

Comets are made of ice, dust, and rocky material. Asteroids are made of metal and rocky material. The Sun is at the center of the solar system. Both comets and asteroids orbit the Sun.

Answer:

They orbit the Sun.