Why does Martin Luther King, in his famous "I Have a Dream" speech, recite lines from the song, "My Country 'Tis of Thee"?

a.He seeks to connect the cause of civil rights for Blacks to broadly-held principles such as liberty and patriotism.

b.He is trying to demonstrate that Blacks have demands that are not shared by other groups in society.

c.He is trying to incite a riot.

d.He is pointing out that Blacks do not enjoy rights that Whites enjoy.