Help! Which comparison of Beowulf and Grendel is most accurate?

A; Grendel is characterized as sensitive in the poem, but he is characterized as cruel in the novel.
B; Both the poem and the novel are all about Grendel; he is the main character in both stories.
C; In the poem, Grendel seems like a heartless monster, but in the novel he is emotionally complex.
D; The poem and the novel are very similar, and both characterize Grendel in the same way.