The rhetorical techniques used by Martin Luther King in the excerpt from "Letter from Birmingham Jail" are:
Figurative language was used when Martin Luther King Jr. likened the actions of his critics to those who came against Socrates.
An extended metaphor is used in the excerpt because the comparison that MLK Jr. used went on for two sentences in each case.
Find out more on extended metaphors at https://brainly.com/question/2237514.
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