Answer :
Enslaved labor was no longer an option was the reason that the South had to reinvent its economy after the Civil War.
What is enslaved labor?
A slave labour group is a place where enslaved humans or persons who are considered as if they are enslaved captives are compelled to undertake slave labour.
Those people who are enslaved and are obliged to labour Slave labour was used to construct the pyramids.
Thus, option C is correct.
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