Answer: to describe the meaning of the shell strings.
In this excerpt, the author explains to us what the meaning of the shell strings is. He tells us that the shells symbolize the union of the nations. Option B is incorrect, as the passage does not discuss anything related to the consequences of disobeying one's tribe. Option C is similarly incorrect, as the passage does not mention any of the traditions of the Lords. Finally, the passage does not explain the history of each tribe.
Acording to the events that were taken as a basis for the setting of the story, If you wanted to support the idea that Beowulf is an epic hero, you might best note that he embodies the ideal of Anglo-Saxon society. This option seems to be the only relevant. Hope you still need the answer, because this one us really helpful.
