The Main Responsibility for "Bleeding Kansas" Rests Upon

The main responsibility for "bleeding Kansas" rests upon

A) Missouri border ruffians who mercilessly attacked the free state partisans.
B) the Pierce administration, which did not ensure honest elections because that might alienate the South.
C) abolitionist fanatics such as John Brown who were unwilling to compromise their principles and were willing to resort to violence.
D) the Buchanan administration, which refused to ensure honest elections because that might alienate the South.