The Chapter Introduction Tells the Stories of Lawrence and Pottawatomie

The chapter introduction tells the stories of Lawrence and Pottawatomie, Kansas, to make the point that

A) westward migration continued despite the distractions of sectional strife.
B) it was deliberate, violent acts by an extremist minority that sucked Americans into civil war.
C) the ability of settlers in Kansas to disagree, yet still get along, shows that the Civil War was not necessarily inevitable.
D) violence in Kansas discredited popular sovereignty, the only remaining compromise solution to the growing sectional split.