How did the election of 1860 contribute to the civil war?

a
southern states believed that abraham lincoln intended to prohibit slavery and started to secede from the union.

b
northern states were emboldened by the victory of abraham lincoln and passed a senate bill outlawing slavery.

c
southern states believed that the election was too close to call and that john breckenridge received the most votes.

d
northern states were emboldened by the apathy of southern voters and proposed an amendment outlawing slavery.