Final answer:
The author included the quotation from President Franklin Delano Roosevelt's inauguration address to show how Magna Carta has been given symbolic meaning. Hence, the correct answer is option D.
Step-by-step explanation:
The MOST LIKELY reason the author included the quotation from President Franklin Delano Roosevelt's inauguration address is to show how Magna Carta has been given symbolic meaning. In the passage, the author mentions how different presidents used their inaugural speeches to convey their visions and set priorities. By including the quotation, the author is emphasizing how Roosevelt used his inaugural address to inspire hope and confidence in the American people, just like the symbolic meaning attached to Magna Carta.