It was Beowulf’s loyalty to the Danes that brought him to Hrothgar to defeat Grendel. I hope that this is the answer that you were looking for and it has helped you.
The answer is A. because the cattle are the cause for us to have milk and beef so they are part of society.
You can start by asking a question for the opening statement about theories (that doesn't include I, you, us, we, etc. unless the teacher says so), or maybe state a well-known theory that was proven false, then go off of that.