Which tone does the language in these lines from the last stanza of "Invictus" convey?

I am the master of my fate;

I am the captain of my soul.

angry and critical

assertive and defiant

humble and discouraged

silly and playful

B. assertive and defiant.

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.