It's mainly because of A and B, because after the war, the industrial resolution happened, and farmers are replaced by machines, farmers has no work to do, their speed is no compare to the machines, so they must move to another place. Also the population in Europe is growing in a extremely fast speed. Hope that helps :)
Invested in the stocks of banks there failing
The answer is B - Mesopotamia
spain is the answer your looking for
The answer is d. slaves were considered prisoners of war and kept in confinement.
