Sentence marked 3, 'Malcolm X is a Negro,' does not belong in the paragraph as it is contextually irrelevant to the rest of Martin Luther King Jr.'s points in that section of his speech.
The sentence that does not belong in the paragraph quoted from Martin Luther King Jr.'s "I Have a Dream" speech is sentence marked 3: "Malcolm X is a Negro." This sentence stands out as irrelevant to the context of the paragraph, which discusses the historical signing of the Emancipation Proclamation, the ongoing effects of segregation and discrimination on Black Americans 100 years later, and the reason for King's speech at the March on Washington. While the other sentences flow together to support King's narrative of continued struggle for freedom and equality, the statement about Malcolm X serves no purpose in the progression of arguments within this excerpt and interrupts the cohesive message about civil rights. The sentence that does not belong in the paragraph is (c) Sentence marked 3: 'Malcolm X is a Negro.' This sentence does not fit in the context because it does not contribute to the discussion of the Emancipation Proclamation, the condition of African Americans, or the purpose of the gathering.