The correct answer is d. hunting -gathering.
Hunting and gathering was already existing before this : in fact the neolithic revolution was going away from this lifestyle and starting farming and domestication of animals.
There where 529,280,000 acres of land in the Louisiana purchase. It was four cent per acre.
The rights of enslaved people to buy, sell, and produce goods were introduced. In some places, slave tags were required to be worn by enslaved people to prove that they were allowed to participate in certain types of work.