The factors that led to the surprise strategic attack of Pearl Harbor was due to many reasons, among which the Japanese imperialistic tendencies were the most obvious one. The Japanese really wanted to have control over those portions of the Pacific which is also the reason why they attacked Pearl Harbor.
Rich, higher level people, specifically plantation owners.
It was harsh. They had to work on the Manor. They couldn't leave the manor nor be forced off it. The person the serf is working for owes them protection and the serfs give labor and loyalty.
..........The answer is D