I believe the correct answer is D. that he is a very strong judge of character.
Even though he is young, Huck knows that his father is just a drunk loser, who would milk him out for money to buy alcohol. Huck is a troubled child who is used to mischief, so he has learned to tell real danger from mere annoyance. His father's behavior does frighten him at first, but it only takes a moment for him to realize that there is no reason to be afraid.
