I believe the awnser is c hope this helps
Source E. Woodrow Wilson confidently expected the USA to join the League of Nations. But many Americans hated the idea. Many had been against US involvement in the war, and they certainly did not want the USA to get entangled in European affairs after 1919.also it was a confrontial us meeting
Its actually not a necessary step for all experiments
The establishment of the Open Door Policy (1899-1900) and the response to the Boxer Rebellion (1900) showed that the United States wanted to (2) gain access to Chinese markets. The Open Door Policy was basically a trade agreement where powers could trade openly with China, but more so in a way to reap benefits than benefiting both countries. The Boxer Rebellion was a rebellion from Chinese nationalists opposing European and American intervention for trade in China.