Final answer:
Option B is the correct answer. President Lincoln supported the Thirteenth Amendment, arguing that slavery should be made illegal throughout the entire United States, reflecting his vision of a united country free of the divide caused by slavery.
Step-by-step explanation:
In support of the Thirteenth Amendment, President Lincoln argued that slavery should be made illegal everywhere. He believed that the existing condition of the United States, being half slave and half free, was unstable and unsustainable. Lincoln's famous quote, “A house divided against itself cannot stand. I believe this government cannot endure permanently half Slave and half Free,” clearly shows his stance that the country could not continue divided by the issue of slavery. Moreover, the Thirteenth Amendment was pursued to permanently abolish slavery, a measure that the Emancipation Proclamation could not provide as it was only a war measure with limited scope.