The correct answer is D, as the phrase "We will research the goal of freedom in Birmingham and all over the nation, because the goal of America is freedom", pronounced in the Letter from Birmingham Jail by Martin Luther King, is closely related to the concepts of freedom stated in the Gettysburg Address by Abraham Lincoln.
The Letter from Birmingham Jail was an open letter written on April 16, 1963 by Martin Luther King, Jr., one of the leaders of the Civil Rights Movement in the United States. King wrote the letter from the prison in the city of Birmingham in Alabama, where he was being held after a non-violent protest against racial segregation. The letter is a response to a statement issued by eight white clergy members of Alabama on April 12, 1963 entitled "A Call to Unity." In it, they declared the existence of social injustices but expressed the belief that the battle against racial segregation should be carried out only in the courts and not carried to the streets. King responded that without strong direct action, like his, true civil rights could never be achieved. It established not only that civil disobedience was justified in the face of unjust laws, but that "one has the moral responsibility to disobey unjust laws."
The Gettysburg Address is the most famous speech by President Abraham Lincoln. It was pronounced in the Dedication of the Soldiers' National Cemetery in the city of Gettysburg (Pennsylvania) on November 19, 1863, four and a half months after the Battle of Gettysburg during the American Civil War. Although Lincoln's carefully worded speech was secondary to other speeches of the day, it has been considered later as one of the greatest speeches in the history of mankind, or, at least, one of the most famous and cited of the modern era. Invoking the principles of equality of men enshrined in the Declaration of Independence, Lincoln redefined the Civil War as a new birth of freedom for the United States and its citizens.
In conclusion, in both cases there is an allusion to the concept of freedom, which is the fundamental pillar on which the existence of the United States of America is based.
