Which of these motivates the actions of both beowulf and grendels mother

B is the correct answer. Beowulf kills Grendel in the poem Beowulf. As a result, Grendel’s mother seeks to avenge Grendel’s death and attacks the mead hall where Beowulf and his friends spend time. Beowulf then attacks Grendel’s mother to avenge the attack on the hall.