Answer: A. Europeans took away the native populations' freedom like Prospero took Caliban's freedom.
The relationship between Prospero and Caliban is a reflection of the relationship between colonies and colonial powers. Although Caliban is the original inhabitant of the island (as well as Ariel), Prospero has enslaved him and now calls himself the King of the island. This is similar to how Europeans took away the native populations' freedom when they established their colonies.
