A and D both fit the definition, but i would go with A
You would never know what the setting is,if the characters are not known and if the settings are unknown the story would have to turn to the theme or the plot. when the charaters are unknown the effect is losing place in the story. It might be confusing but if it help letme know!!
Well, Odysseus was going to kill him, until he realized that the giant, named Polyphemus I believe, was the only thing in the cave strong enough to move the boulder blocking them from getting out.
Hope this helps!