Question ID:PT66 S4 Q17 Passage:Although Pluto has an atmosphere and is much larger than any asteroid, Pluto is not a true planet. Pluto formed in orbit around the planet Neptune and was then ejected from orbit around Neptune when Triton, Neptune's largest moon, was captured by Neptune's gravity. Stem:The conclusion of the argument follows logically if which one of the following is assumed?  Correct Answer Choice:EChoice A:No celestial body can simultaneously be a moon and a planet. Choice B:Not all celestial bodies that have an atmosphere and orbit the sun are true planets. Choice C:If Pluto had not been ejected from its orbit around Neptune, Pluto would not have its current orbit around the sun and would still be a moon. Choice D:The size of a celestial body in orbit around the sun is not relevant to determining whether or not it is a true planet. Choice E:For a celestial body to be a true planet it must have formed in orbit around the sun exclusively.