As the Civil War Continued and Casualties Mounted, Opinion in the North

As the Civil War continued and casualties mounted, opinion in the North became increasingly bitter toward Southern slave owners. Many Republicans joined the abolitionists in calling for emancipation of the slaves

A) because it was the right thing to do.
B) because it would increase their labor pool.
C) to get more customers for the goods they produced.
D) simply to punish the "rebels."