What event was the main precipitating incident of the Civil War?

Here is the question :

WHAT EVENT WAS THE MAIN PRECIPITATING INCIDENT OF THE CIVIL WAR?

Here is the option for the question :

• Missouri Compromise
• Harpers Ferry Raid
• Nebraska-Kansas Act
• Nat Turner uprising

The Answer:

And, the answer for the the question is :

Explanation:

[STC003943] In mid-October 1959, abolitionist John Brown attempted to raid the U.S. arsenal in Harpers Ferry, Virginia, in an effort to establish an enslaved people uprising in the South. Brown ultimately failed, and when he was hanged later that year for his crime, he slipped the guard a piece of paper stating ‘…the crimes of this guilty land will never be purged away but with blood.’ The infamous raid stoked the fires of both abolitionists and enslavers’ passions for their respective causes, which ultimately led to civil conflict in the nation.