Answer:
B. assertive and defiant.
Step-by-step explanation:
It would make sense because when one is assertive and defiant, they are disobedient, meaning that by saying I am the master of my fate; I am the captain of my soul. He is saying that his life is his own, which could be disobedience defending on the background of the story, like if he were a slave, he would then be disobedient.