Which lines best complete the sentence? check all that apply. grendel, by john gardner, is written in
a first person to show a single perspective.
b to tell an old story from a new point of view.
c so that beowulf’s feelings can be understood.
d with grendel acting as a first-person narrator.
e using first person to show hrothgar’s perspective.

I believe the answer is:

A first person to show a single perspective.

B to tell an old story from a new point of view.

D with Grendel acting as a first-person narrator.

The story use the pronoun 'I' whenever the main character speak, so we can infer that it is a first person with single perspective.

As readers read deeper into the story, we would see that the narrator is the author which told us a story about his past experience. From this we can ifner that Grendel is acting as a first person narrator and relieve the event from a more mature point of view.