The statement here is true.
The journey into the abyss or the underworld is an essential step on a hero's journey. It symbolizes the evolution of a hero, who will be later reborn as savior and would transform in a man that will be able to accomplish his destiny. Here the hero shows the willingness to improve himself as he separates from all that he has known.
B) mainly
The word "mainly" shows that the story of Huck Finn is more fiction than fact. He repeats this word many times when he is talking about the story being one of truth. This intensifier introduces the idea of the story being a bit exaggerated and fictional. The other words add to the characterization of Huck. He uses ain't simply to mean isn't. When he says "that ain't no matter" he means that it is no big deal. Without is used to mean exactly that and is not meant as an opposite.
1. My friend is a chef, he works long hours, but he loves it.
2. Are you really a pilot? Wow.
This isn't an answer. There's nothing italicized
