I presume you have these lines in mind:
"CALIBAN (kneeling): As I told thee before, I am subject to a tyrant, a sorcerer that by his cunning hath cheated me of the island."
The correct answer is B: He is enslaved by a tyrant. He then explains that his tyrant (Prospero) has cunningly deceived him and took his island from him. Caliban wants Trinculo and Stefano to help him murder Prospero and retrieve the island.
Trespassing or Intruding would be the answer.
I believe that the speaker in "Invictus" considers independence and control most important in life. He says that "he is the master of his soul", meaning that no one else can control it.
