Question

choose the best option for the blank.
______ have a dusty, icy composition and generally orbit the sun far beyond neptune.
choose 1 answer:
(a) asteroids
(b) comets
(c) both comets and asteroids

Explanation:

Asteroids are mainly rocky and orbit mainly in the asteroid belt between Mars and Jupiter. Comets have a dusty, icy composition (called a nucleus) and many comets have orbits far beyond Neptune in the Kuiper Belt or Oort Cloud. So comets match the description.

Answer:

B. comets