Prewriting
Drafting
Revising
Editing
So A doesn’t really go with it so you can rule that out. The main character doesn’t get introduced can you can rule out D too. It’s between B and C. I honestly would go with C the author sets up the hook of the story.
A progressive form of a verb is formed with the ending "-in": the only verb form in the options that is formed with the ending "ing" is in option b.
The correct option is b: will have been falling. This tense is the future perfect progressive tense.