The answer would be, to support a cause
Answer: Idk GURLFRIEND SOWWY ill look of ru
Explanation:
A because it was a major conflict that happened before the famous battle
C) The Soviet Union was not a participant at the Washington Conference of 1921. This was a military conference, with nine countries attending which were: the United States,Japan, China, Great Britain, Belgium, France, Netherlands and Portugal. The conference was in regards to interests in the Pacific Ocean and East Asia.
Do not hate me if this is incorrect, but I do believe it is A/1, because, after some research, that is what has come up historically, but Google could be wrong. I'm not sure if it's right, but it is the one I would go for, and rely on.
Have a good day!