Answer: B. The setting.
Explanation: The setting of a story or a text is the place and time where the story takes place, it can also be the context of the story (political, historical, cultural, etc). In the given stanza from "Jabberwocky" by Lewis Carroll, he seems to be describing the setting of the story, because he is describing a place where the story is going to take place ("Twas brillig, and the slithy toves Did gyre and gimble in the wabe").