The Emancipation Proclamation limited the abolition of slavery to certain regions in order to A. retain African Americans drafted into the Union Army
B. preserve the Constitutional requirement for due process beach
C. maintain the support of political leaders in the border states
D. avoid offending Abolitionists like William Lloyd Garrison

C

Explanation:

Believe it or not, a few slave states were actually apart of the Union during the Civil War. Kentucky, Maryland, Delaware, and Missouri were all slave states that decided to stay apart of the Union. Therefore, Lincoln knew he had to ensure that they did not switch sides by making the Emancipation Proclamantion only apply to Confederate states.