How does the phrase "a more perfect union" in paragraph 25 contribute to the development of ideas in the speech?
A. The phrase implies that Obama believes that the United States will never be
perfect and Americans should recognize the country's faults.
B. The phrase references a similar phrase in the U. S. Constitution, emphasizing the
unconstitutional discrimination African Americans have faced and continue to
face today.
C. The phrase emphasizes Obama's hope for a better, more united future in the
U. S. and the efforts that must be made to reach this.
D. The phrase suggests that Obama believes that the country has substantially
improved in the past few decades and does not require much more
improvement.