Question

Pluto has a shape that is nearly round, and it orbits the Sun. It has five known moons. Why is it called a dwarf planet and not a planet?
It is too far from the Sun.
It has other celestial bodies of comparable size and mass in its orbit.
It is not large enough in size.
It does not have rings.

Answer 1

@JustSaiyan

Answer 2

it has other celestial bodies of comparable size and mass in its orbit, namely frozen bodies left over from the formation of the solar system