The correct answer is B) slavery should be made illegal everywhere.
In support of the Thirteenth Amendment, President Lincoln argued that
slavery should be made illegal everywhere.
The 13th Amendment to the United States Constitution was ratified by the necessary states on December 6, 1865. It abolished slavery in the US. From now on, slavery in the country only could be a form of punishment when someone committed a crime.
Unfortunately for Abraham Lincoln, he couldn't witness this important moment in the history of the US because he was assassinated on April 15, 1865.
When one reads the 13th Amendment to the United States Constitution, you notice a loophole: "...except as a punishment for crime..."
This loophole has been used in the history of the United States to send people to jail and punish African Americans in periods of history such as the case of the Jim Crow legislation and the black codes in the southern states.