Answer:
The correct answer is C. During his presidency, Lincoln didn't see the passage of the Thirteenth Amendment abolishing slavery, as he was killed before its ratification.
Step-by-step explanation:
Abraham Lincoln and others were concerned that the Emancipation Proclamation was seen as a temporary measure only during the Civil War and, therefore, in addition to the liberation of slaves in those states where slavery was still legal, they supported the Amendment as a means of guaranteeing the permanent abolition of slavery. But President Lincoln was assassinated on April 15, 1865, and the Amendment was ratified on December 6 of the same year, so he couldn't see its entry into force.