The correct answer is B, as the "10 Percent Plan" involved issues related to the end of the American Civil War.
This plan, whose formal name was Proclamation of Amnesty and Reconstruction, established the conditions of former Confederate states to rejoin the Union: ten percent of the voters of the 1860 elections of that state were to swear allegiance to the Union and bow to its ideals. In addition, the state that wanted to rejoin the Union had to abolish slavery.
