Answer:
A) moon and comet
Step-by-step explanation:
A moon is a natural satellite of a planet. It is a rocky object that revolves around a planet. On the other hand, comet can be considered as a dirty snowball. They are mainly made up of dust and frozen gases. The comets are much smaller than the moons in the solar system. While the size of the moons can be around 5000 km in diameter, the nucleus of a comet can be just around 100km.