Answer: C) Allusion.
Step-by-step explanation: An allegory is a story with a deeper or more general meaning, apart from its obvious or superficial meaning. Alliteration is the repetition of the initial sounds of two or more words that are consecutive or close to each other. An apostrophe is when a character in a literary work speaks to an object, an idea, or someone who doesn't exist as if it is a living person. And finally an allusion is a casual reference to a person, a place, an event (historical, political, cultural, etc). The given line from Martin Luther King’s “Letter from Birmingham Jail” is an example of allusion to a quote by T. S. Elliot.