In what way does Unferth, one of Lord Hrothgar's men, challenge Beowulf? A.Unferth criticizes Beowulf for being prideful. B.Unferth dares Beowulf to fight him in a sword duel. C.Unferth accuses Beowulf of disloyalty to the Scylding king. D.Unferth blames Beowulf for their kingdom's sorrows.