Why isn’t Pluto currently considered a planet?
A. Pluto’s orbit around the sun is larger than that of any of the eight planets.
B. Pluto is smaller than all of the eight planets.
C. Pluto has a moon, Charon, which is more than half its size and larger than other planets’ moons.
D. Pluto’s gravity is too weak to pull in smaller debris, so it hasn’t cleared its orbital path.