Pls help: Pluto was once classified as a planet. However, scientists no longer classify Pluto as a planet. Which is a likely reason for this change?

The original hypothesis about Pluto was supported.
No observations of Pluto were made in the past.
Several planets in outer space were found to be similar to Pluto.
There were significant changes in scientific knowledge about planets.

I believe it is “There were significant changes in scientific knowledge about planets”

Explanation: Since scientific knowledge has grown about planets, Pluto doesn’t fit some descriptions in order to be classified as one.

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