Final answer:
The falling action of "The Monkey's Paw" is when Mr. White makes his third wish to return his son to the graveyard, winding down the story's conflict.
Step-by-step explanation:
The part of "The Monkey's Paw" that would be considered part of the story's falling action is B. Mr. White makes his third wish on the monkey's paw to return his son to the graveyard. The falling action occurs after the climax of the story when events start to wind down, and the characters come to terms with the consequences of their actions. In this scenario, Mr. White's final wish effectively ends the horror brought about by his previous wishes and brings the narrative closer to its resolution, showing a shift from the tension and conflict towards the story's conclusion.