Answer:
The fireside poets focused on the injustice of slavery. (B)
Step-by-step explanation:
They wrote on the topics which openly opposed slavery and its concept. Their poems can be refered to as highly didactic poem and emphasises on the conventional nature of the nineteenth century. They opposed slavery and the atrocities related to it so that the people are aware of such conditions prevailing in the society and the slaves get the motivation to voice their opinions.