I’m going to try to give this to you via comment section because it includes too many words.
(Now, this is something I pulled off the web. You could turn this in, but I don’t recommend that. Just read over this instead of the actual book if you don’t have enough time, and rewrite some of it in your own words, or rewrite it all yourself based on this.)
Freedom theme best represents Vonnegut's story Harrison Bergeron.
The characters in the novel are superficially equal but none of them are truly free under the oppressive rule of the Handicapper General.
B. Royalty living in the "Old World"
Why?
Because Irish Immigrants, Native Americans, and African Americans were all mentioned as dreamers in "Let America be America Again" but Royalty living in the "Old World" was not mentioned to be a dreamer in the poem. Therefore, the answer is B. Royalty living in the "Old World".