Read this line from "O Captain! My Captain!". The ship is anchor'd safe and sound, its voyage closed and done; What does this line refer to?

The ship is a metaphor for the Union and its people, and the voyage represents the Civil War. Saying it is “safe and sound” and its voyage is “closed and done” means the Union has survived and the war is over. Choice C captures that meaning; the line is not just a literal description of a ship at a dock.

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