Which statement provides evidence that slavery in the south existed for economic reasons?
a.
slaves from the northern states crossed over to the south in search of work to stay alive.
b.
most landowners in the south owned slaves because slavery was legal in these areas.
c.
cotton and tobacco plantations in the south required an increasing supply of slave labor.
d.
the fugitive slave act forced citizens in the north to hold slaves who had crossed over from the south.