Which research question would LIKELY fit the comparison and contrast organizational method?

Responses
A What types of symbolism are used by Dr. Martin Luther King, Jr. in his I Have a Dream Speech addressed to the American public?What types of symbolism are used by Dr. Martin Luther King, Jr. in his I Have a Dream Speech addressed to the American public?
B How many American documents address segregation?How many American documents address segregation?
C How do the Constitution and the Declaration of Independence differ from the Emancipation Proclamation?How do the Constitution and the Declaration of Independence differ from the Emancipation Proclamation?
D What is the Emancipation Proclamation?What is the Emancipation Proclamation?

C How do the Constitution and the Declaration of Independence differ from the Emancipation Proclamation?