The answer is B. Epics reflect the values of a culture. The hero in the epic is always the quintessential man. He is strong and brave and seeks adventure to better himself and his people. All men must strive to be like the epic hero. The monster in the epic is the representation of the Other; the thing that no man must ever be. They are often grotesque, break the rules, defy taboos and are inferior.
With the other options, epics were originally spoken and are now written down (not the other way), epics have vast settings far from the localized area, and hero's do not have inner struggles in epics because they are perfect.
Because no one has ever really seen it before and there is no evidence of there ever being a kind of creature in existence like the Loch Ness monster, which is supposedly a dinosaur-like swan/snake by it's description.
