Final answer:
Beowulf is certain of victory in his conversations with Hrothgar, as proven by his confident statements and intention to face Grendel without weapons.
Step-by-step explanation:
The answer to the student’s question lies in an analysis of the epic poem Beowulf. Based on Beowulf's conversations with Hrothgar, the answer is (a) Beowulf is certain of victory. When Beowulf speaks to Hrothgar, he does so with great confidence. For instance, he says confidently that he intends to face Grendel without weapons and shows no fear, indicating his confidence in his abilities and the certainty of his victory over the monster. There is no textual evidence of Beowulf expressing fear or uncertainty about the possibility of Grendel defeating him in his discussions with Hrothgar.