Answer:
A. A number equal to the state's number.
Explanation:
I think its C, because the US wanted to isolate more and more from other countries.
Southern states had slaves and Northern States was more about the industrial items. And even though northern states had less slaves they both had slaves. Richer soil in southern states allowed cropping which had to be farmed by slaves, weaker not good soil caused northern to use machines in others stuff so slaves where not need as much.
The answer is D. There were many job opportunities available in the North.