Question

In 1930, scientists discovered Pluto and labeled it as the ninth and smallest planet in our solar system. Later, other planet-like objects that were larger than Pluto were discovered. This caused scientists to redefine the term "planet" in 2006, and Pluto was relabeled as a dwarf planet.
So, the discoveries that followed the finding of Pluto led to the...

A. changing of Pluto's composition.
B. changing of Pluto's classification.
C. changing of Pluto's original location.

Answer 1

The answer is

B. changing of Pluto's classification.

This is because they originally classified Pluto as a regular planet.

Hope this helps!