The Kansas-Nebraska Act of 1854 created a firestorm of opposition because it A. prohibited slavery in Kansas and Nebraska as well as confirming the rights of New Mexico and Arizona settlers to prohibit slavery

B. Extended the northernmost boundary for slavery, as defined in the Missouri Compromise, from the southern border of Missouri and the western border of the Louisiana territory to the Pacific Ocean.

C. Allowed slavery north of the line agreed upon in the Missouri Compromise, effectively repealing it.

D. Mandated the extension of slavery in all Western territories except California in return for the creation of the Nebraska and Kansas territories

E. Legally repealed the doctrine of popular sovereignty in the Western territories