It is a way to find out the purpose that is going to be achieved in a short story and to list details about it.
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After a thorough research, there exists a similar question with the following choices:A. Climax B. Falling action C. Resolution D. Exposition.
The last part of the Beowulf excerpt recounts how Grendel flees into the darkness after suffering a fatal wound from Beowulf. That part of Freytag's pyramid best fits in the section of the story is would be (B) Falling Action
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