CORRECT ANSWER:
c. Grendel's head
Explanation:
You will find the correct answer in the text, it says: " To avenge Aeschere’s death, the company travels to the murky swamp, where Beowulf dives into the water and fights Grendel’s mother in her underwater lair. He kills her with a sword forged for a giant, then, finding Grendel’s corpse, decapitates it and brings the head as a prize to Hrothgar."