Pluto was demoted from full planetary status in 2006 because
A. Pluto resides outside of the zone that can truly be described as the solar system.
B. Pluto was discovered to be a twin planet system.
C. of objects as large or larger than Pluto in the Kuiper belt.
D. according to the standard definition, no planet can be smaller than the Earth's moon.
Answer: C
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