I think for the salvation. i think ( is it correct)
Forcefully is the correct answer
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.
Some internet sources are not reliable that anybody can edit i would say some examples but i can not state them here,