Final answer:
Asteroid orbits are mostly found near the ecliptic plane within the asteroid belt, while comet orbits are highly eccentric and can be found in any plane. The correct answer to the question is D. asteroids, comets.
Step-by-step explanation:
In our Solar System, the orbits of objects such as asteroids and comets vary significantly due to their different characteristics and origin. The orbits of asteroids are mostly found within a specific region of space known as the asteroid belt, which is located between the orbits of Mars and Jupiter, ranging typically from 2.2 to 3.3 AU (astronomical units) from the Sun. These orbits are relatively close to the ecliptic plane, the imaginary plane that encompasses the Earth's orbit around the Sun.
In contrast, comets have highly eccentric orbits, with a range of inclination angles, meaning they can orbit in any plane around the Sun. Their orbits are larger and more elongated compared to those of asteroids, often taking them far outside the ecliptic plane on paths that bring them sporadically into the inner Solar System. As they approach perihelion, their speed increases dramatically due to the gravitational pull of the Sun.
Answering the student's question, the orbits of asteroids are most likely to be found near the ecliptic plane, whereas comets orbit in any plane. Therefore, the correct answer is D. asteroids, comets.