Lowell’s study of Mars eventually led to the discovery of Pluto, which was later downgraded to a dwarf planet.
Explanation:
With what I know, which is very little seeing as I didn’t read the passage, I would say this is the best/closest answer listed. It explains what happened in the passage with as much information as they could put into one sentence without giving too little or too much. I’m sorry if it isn’t correct!
