Question

The debate surrounding the classification of Pluto has been ongoing since the International Astronomical Union (IAU) redefined "planet" in 2006. This reclassification demoted Pluto to a "dwarf planet." Proponents of the change argue that the updated definition is necessary for scientific consistency. The IAU's criteria require a planet to have cleared its orbit of other objects, which Pluto has not done. Opponents, however, contend that the new definition is too narrow and that Pluto possesses many planetary characteristics, such as a round shape and moons. They argue that size and orbital path should not be the sole determinants of planethood.

Which choice best states the main idea of the text? Choose 1 answer:
A The IAU's 2006 decision to reclassify Pluto was widely accepted by the scientific community.
B The reclassification of Pluto as a "dwarf planet" was based primarily on its small size and lack of moons.
C The debate over Pluto's status continues, with scientists disagreeing on the criteria for defining a "planet."
D Proponents of Pluto's reclassification argue that the definition should depend on whether an object has a round shape.

Answer 1

C

The passage's main idea is that Pluto's status remains disputed, with scientists disagreeing over the criteria for what constitutes a planet.