The correct answer is D. It underscores that unity is needed to achieve civil rights.
Step-by-step explanation
Martin Luther King Jr's excerpt of his speech called "I have a dream" expresses his dream of having a country where civil rights are respected. In this speech, he uses paralelism because he includes similar structures such as "to work together, to pray together, to struggle together, to go to jail together, to stand up for freedom together". Moreover in these Luther King emphasizes the importance of unity by repeating the word together. From the above, it can be inferred that the correct answer is B. It encourages patriotism by evoking the memory of a childhood song.