Answer:
Correct answer is Both A and C are correct, but for different parts of the story .
Explanation:
Both A and C are correct because in option A this refers to Eschere, who was a close advisor of King Hrothgar, who really was killed by Grendel's Mother.
C is also correct as a great warrior Beowulf believed that his task was to defeat the monster.
Option B is not correct, as Beowulf had no punishment or obligation to go after the monster.