The correct answer is B) states fighting against the United States.
This proclamation applies to states fighting against the United States.
The excerpt of the text refers to the Emancipation Proclamation issued by President Abraham Lincoln in January 1863. The Proclamation freed slaves in the United States although this was not immediately possible because the Civil War was still fighting. The Proclamation is addressed to the Confederated States that had black slaves working long hours in the southern plantations.