The answer is letter C.Grendel's Mother Grendel's mother is one of the antagonists of Beowulf. She is known to be one of the descendants of Cain. She had attacked Heorot as a form of revenge. Beowulf had tried to kill her as he went to her cave with the hopes to kill her.
Imagery is when you describe something visually with words. In this sentence, "sharp hiss" is imagery because it makes you think of what is happening like an image.