What Was the Attitude of Northern Industrialists Toward Slavery

What was the attitude of Northern industrialists toward slavery?

A) Northern industrialists strongly supported slavery and used slaves in many factories.
B) Northern industrialists opposed slavery for the North, but were in favor of allowing its expansion into the West.
C) Northern industrialists strongly opposed slavery and also opposed its expansion into the West.
D) Northern industrialists opposed the formation of the anti-slavery Republican Party and remained staunch Democrats until the 1990s.