The battle had taken place at the battle hall as Grendel’s
mother took Beowulf there in which is owned by someone and that Grendel’s
mother inadvertently give Beowulf the advantage because the water that is
present in the battle hall didn’t hurt Beowulf.
The correct answer is A. reliable.
The writer was 'an authoritative source' because of her degrees, guest appearances, etc. Thus, she was a source you could rely on, she was reliable, given that she had experience to back her ideas up. Therefore A is the only correct answer.
