It would be C, because that is the main thing discussed in the short passage. Avoiding Kayla is a tricky one because that's disucssed, but think about what this is all about "cheating and copying". In order to find what is best described, look at the keywords in the statements. If it doesn't talk about it much, cross the option out. Hope that helps :)
Grendel is one of the three antagonist's in the epic Beowulf. Grendel, in the epic, has created a havoc in Heorot, making all of the city's citizen fearful of him.
Grendel is mainly seen as monstrous and a giant. Grendel is described as a monster, a giant, and a descendant of Cain in the epic. His monstrous nature has been described more elaborately by the poet by stating that he consumes men after killing them.
So, the correct word to complete the sentence is monstrous.