How is it that Pluto is not always the farthest planet of the solar system?

A. Each planet becomes the farthest planet in its turn. Now it is the turn of Piuto

B. The Sun is now in the zodiac in which it is nearest to outer planets

C. The eccentricity of Piuto's orbit being substantial, this orbit cuts the orbit of Neptune

D. Piuto belongs to other solar system

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