A ship transporting slaves, especially one carrying slaves from Africa. And it’s also a book (kinda long but entertaining)
The primary characteristic of a feudal society is the exchange of land for services.
The overlord will grant the vassal a land in exchange for the vassal's services. Services like fighting beside the lord in terms of war. Vassals have their own men and since the vassal is at the service of the overlord, his men is also at the service of the overlord.
the answer will be B
Historians use the historical thinking skill of chronological thinking to determine which events could have influenced others later in history.