Answer:
Ginny should classify it as a D. Comet.
Step-by-step explanation:
A comet is known as a small celestial object which tends to travel through the solar system. Since it is a body of ice, rock and dust, when it get close to the sun, it generates a shining "tail", which is a comet's main trait.
Another way for Ginny to know this is a comet is by disproving the other options; a planet does not generate a shining tail and a star does not tend to move. An asteroid is different from a comet because of its composition; the comet is made of ice, rock and dust and an asteroid is mainly a rock and would not leave a tail.