Answer:
Europeans traded in slaves because this was a free source of labor. They did not need to do the strenuous work by making their slaves do it for them, so it was on a high demand
The answer is B) autocracy.
rep. gov. would be a democracy
oligarchy has multiple rulers
It would be D, it's about survival with nature. kind of like man vs nature. (which you'll learn in high school)
The Jews believed Moses had written them a system of laws for them to follow which were called Mosaic Laws. So Mosaic Laws should be your answer. :)