hy was Pluto reclassified as a dwarf planet?a. The definition of a planet was clarified: a planet must have a spherical shape. Pluto is not large enough to assume a spherical shape.b. The definition of a planet was clarified: a planet must have radius more than 1500 km. Pluto is not large enough and is a dwarf planet.c. The definition of a planet was clarified: a planet must be able to clear away objects orbiting nearby. Pluto is not large enough for this.d. The definition of a planet was clarified: a planet must have radius more than 1500 km. Pluto satisfied this condition when it was discovered, but it has become smaller over time.

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