This Statement Expresses the Main Idea in Which of the Following

Multiple Choice

This statement expresses the main idea in which of the following documents?: "...all persons held as slaves within any State or designated part of a State the people whereof shall then be in rebellion against the United States shall be then,thenceforward,and forever free."

A) Gettysburg Address
B) Emancipation Proclamation
C) the "Cornerstone Speech"
D) the Declaration of Independence