Credible would be
Someone who's credible is honest and believable. ... Similar to words like reliable and plausible, credible is an adjective that comes to us from the Latin credibilis, meaning “worthy to be believed.” A credible reputation is often earned through consistent good behavior and an overall trustworthy personality.
I think it might be B if not sorry
The irony shows that although the Monster is depicted as a monster, it is actually Victor who is the true monster due to everything he has done and the way that he dealt with consequences. The monster is described so as to instill fear, but is not really monstrous in its behavior.
The answer is b. because this way you can hear all the characters thoughts and what they are saying. this lets you know how they truly feel versus how they want you to think they feel.