Determine which of three criteria for the current definition of a planet is not

Question

Determine which of three criteria for the current definition of a planet is not satisfied by the following celestial objects:
(a) A moon-sized object within the asteroid belt. (b) A potato-shaped object orbitting the Sun between Venus and Earth. (c) A spherical object orbitting Jupiter. (d) A Mars-sized object orbitting the Sun at the same distance as Uranus. (e) A heavily crated dog-bone shaped object with two small moons in orbitting the Sun beyond Neptune along with other similarly sized objects.

Explanation / Answer

(a) it has not "cleared the neighborhood" around its orbit

(b) does not have sufficient mass to assume hydrostatic equilibrium (a nearly round shape)

(c) does not orbit around the Sun

(d)  it has not "cleared the neighborhood" around its orbit

(e) does not have sufficient mass to assume hydrostatic equilibrium (a nearly round shape)

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