The poetic device the speaker is using is allusion it this line. Option A is correct.
Allusion is a figure of speech that refers to a well-known story, event, person, or object in an attempt to make a comparison in the readers' minds. According to that definition, Bacchus, Satan, and the Hangman aren't actually characters in this literary piece of work, but the author is making a reference to them nevertheless.
Charles was stuck on Camazotz and the only person who could save him was Meg. Meg went back to Camazotz alone to save her brother from IT. She used her love for her brother to rescue him from IT's hold.
