The “i have a dream” speech referred to which historic american document?

The Declaration of Independence is referred in the “I Have a Dream” speech.

To add, John Trumbull's Declaration of Independence is a 12-by-18-foot oil-on-canvas painting in the United States Capitol Rotunda that depicts the presentation of the draft of the Declaration of Independence to Congress.

i believe the answer is c

i would say your answer is a)

sorry if im wrong