He defended slavery and was hanged for doing so.
B. The population tended to be small. Hunting-gathering methods of obtaining food couldn't support larger populations we see today; population only started to really grow when agricultural methods were developed, and sedentary societies started cropping up. (Get it? Cropping? Crops? Farming?)
The answer is B. The compromise was primarily for "fair" representation in congress for the slave states as well as keeping the states from fluctuating too high from state to state based off if its a slave state or not