Why Was It Difficult for Northern Abolitionists to Develop a Practical

Why was it difficult for northern abolitionists to develop a practical program that would eliminate the institution of slavery throughout the country?

A) Southern states generally had much better lawyers than northern states.
B) There was a serious lack of strong northern congressional leadership.
C) The Constitution protected state laws that allowed slavery.
D) Southern plantation owners donated heavily to northern political candidates.
E) The issue of slavery was overshadowed by more pressing problems.