I believe the answer is: B. To show that Grendel cannot rely on nature for protection
In the story, Grendel perceive that he is blessed by protection from the nature which would always help him in all of his troubles. But when he somehow got his foot stucked in a tree in front of a bull and when he cried and scream for help from the nature, he did not receive any answer.
I think the correct answer is the first option. The novel form is most closely related to poetry writing form. Novel are fictional stories that are lengthy while poetry can be fictional or non-fictional and are written relatively shorter. Both of them narrates a story in an artistic form.
