Astronomers study many different kinds of objects in our Solar System. Which of the following best describes a difference between comets and asteroids?
A. Comets orbit planets, and most asteroids orbit the Sun.
B. Comets are hot balls of gas, and asteroids are made mostly of ice.
C. Comets are made mostly of ice, and asteroids are made mostly of rocks.
D. Comets orbit the Sun between Mars and Jupiter, and asteroids form patterns
in the sky.