On the eve of the 1864 Republican national convention, Lincoln urged the inclusion of which of the following in the party platform?

A) A detailed plan for the readmission of the Southern states to the Union
B) A promise that the Republicans would seek a negotiated settlement with the South
C) A plank calling for the adoption of a constitutional amendment prohibiting slavery
D) A plank calling for legislation to extend the right to vote to African Americans

Lincoln was a staunch opponent of slavery and had already issued the Emancipation Proclamation in 1863. Including a plank in the party platform calling for the adoption of a constitutional amendment prohibiting slavery would have been in line with his beliefs and actions. Additionally, Lincoln understood the importance of solidifying the Republican Party's support for the abolition of slavery, especially as the country was still in the midst of the Civil War. While re-admitting Southern states to the Union and extending the right to vote to African Americans were certainly important issues, they were not as central to Lincoln's agenda as abolishing slavery.