C
expanding the Chinese empire by conquering other lands
The answer is B. Without the United States, the League lacked the firepower to actually make a huge difference without the individual nations suffering huge consequences. In turn, the League didn't do anything, thus they were ineffective and nothing but a figurehead for democracy and international peace.
The Iriquois League was made for many reasons. The main one was to settle differences amongst the tirbes themselves.
So that it isn’t biased and people make sure the law is actually worthy and not something insignificant