Answer:
Right choice: b.
Step-by-step explanation:
Slavery was the most important issue of political debates and clashes within the Democratic Party and in other parties in the electoral year of 1860. The Northern Democrats didn´t want to allow slavery in western territories, a standing Southern Democrats couldn´t share. Northeners were inclined to give more powers to the federal government, whereas Southerners were supporters of the idea of giving more powers to the states in handling their own affairs, particularly slavery.