Your answer would be B.
Why? The others don't make sense.
The long wait on angel island took place in America within the period of 1920s. The story depict the struggle of chinese immigrants who fought to escape communism and find a new opportunity on the freedom land.
This writing is considered a historical fiction because it does not provide any concrete evidences of it's actually happened.
Isolationism was considered a goal by our first president, George Washington. This is considered to be so because the nation wanted to keep its freedom. Because it was told by Washington, That is probably why it was so popular.
I remember having an assignment with this question. I put that they did it work together to establish businesses.