C: I ran out of time and didn't finish.
Sentences need a subject and predicate, generally a verb.
In this case, options A, B, and D don't have an actual subject.
Grendel's mother has probably done this as retaliation for the Danes' hanging her son's claw up as a trophy.
I do hope I helped you, good sir! :)
C this is because Homer sounds smart
"The subterranean world of the behind-the-scenes television powerbrokers"
I believe this is what you mean.