The correct option is B). land and slaves.
What was main source of income in southern states?
The economic value of slaves in the southern states, exceeded the invested value of all of the nation's railroads, factories etc. So, the slavery was so profitable.
The major part of the economy in southern states was based on agriculture because soil was fertile and good for farming. They became the economic engine by growing crops like cotton rice and tobacco.
Hence, land and slaves were wealth based on in southern states.
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