It is easiest to order your ideas when you have developed an outline of your ideas.
I think it's A. It is definally not the climax as this happens when Beowulf kills the monster. It's not the resolution either as it is the first part of the text. Also, exposition seems a little unrelated.
It can change a lot of stuff, including a persons entire view of the story. Imagine if the harry potter movies or something like that came out in a different order. Probably would be a lot different now.
