Because he got locked up in jail
I think it is B im sorry if im wrong
Highlights from the text:
North to prosper the idea that the plans are reuniting the nation without resolving the fundamental conflicts at the root of the division between North and South the idea that the conflicts between the North and the South were too big to solve and the regions should be left alone to resolve their own problems.
This sentence in the writing covers the answer to the question.
I think it was wise because as we know France, U.K. and USA were very strong. But if they were to let other countries join the conference they would start demanding land. Because the U.K. and France promised independece to the Arabs but France and U.K. made a deal behind their back. So if they allowed the Arabs to come they might use that against them and they would get their land. If France and U.K. did that they would power over the coloines they own. They wanted to remain on top so I think it was wise. They would need all that power anyway to defeat the Axis in WW2.