Answer:
I think it would be A and D
Step-by-step explanation:
Abolitionists were the ones who believed in the end of slavery.
A would work because abolitionists were openly supporting their ideas, and this would cause tension among them and the supporters of slavery because their views were the complete opposite of the supporters of slavery.
B would not work because literature by abolitionists would be biased, supporting their views and opinions while denouncing views in the south.
C would not work because "southern" here implies politicians who support the views of pro-slavery, and that is the opposite of what abolitionists believed, and the north was primarily of abolitionists.
D would work because abolitionists would describe the brutality of slavery as one of their main and key points of why slavery should be abolished.
Hope it helps!