Why did the writers have grendel being hrothgars son

Explanation:  

I think this made for a more understandable plot point for people, as most of them were, who had never read the play before. Hrothgar would have had made a deal with the Devil and Grendel would have been the consequence. It's the sort of bargain that we might see in Faust or Macbeth.

the purpose of a nonfiction text is to give the text a rap up. for example, when i say : frogs are interesting animals is an ending. then when i say: frogs are unique in different ways. that is an intro.

the answer is c? i just got it write