Answer:
C. States with slavery.
Explanation:
The 3/5th Compromise in the Constitution essentially counted every "3/5th of a slave" as a person. Under this regulation, therefore, for every 5 slaves in the state, 3 of them will be counted towards population.
This, essentially gave more "citizens" to the south, allowing them to have more representatives in Congress. On the other hand, having more population means that the South had to pay higher amounts of taxes, which benefited the North.
Of course, representation in the federal government holds more significance than being taxed more, and so was seen as most beneficial to states with slavery.
Learn more about the 3/5th Compromise, here:
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