While researching a topic, a student has taken the following notes:
* Astronomers estimate that the number of comets orbiting the Sun is in the billions.
* 81P/Wild is one of many comets whose orbit has changed over time.
* 81P/Wild's orbit once lay between the orbits of Uranus and Jupiter.
* The comet's orbit is now positioned between the orbits of Jupiter and Mars.
The student wants to make and support a generalization about the orbits of comets. Which choice most effectively uses relevant information from the notes to accomplish these goals?
A:
Astronomers estimate that the number of comets orbiting the Sun is in the billions; the comets' orbits may change over time.
B:
Like Uranus, Jupiter, and Mars, billions of comets orbit the Sun.
C:
One example of a comet is 81P/Wild, whose orbit around the Sun once lay between Uranus's and Jupiter's orbits but is now positioned between those of Jupiter and Mars.
D:
A comet's orbit around the Sun may change over time: the orbit of comet 81P/Wild once lay between the orbits of Uranus and Jupiter but is now positioned between those of Jupiter and Mars.
