Answer: D. In Beowulf, his thoughts are nonexistent, but in Grendel, his thoughts are clearly shown
Step-by-step explanation:
In Beowulf, Grendel is portrayed as just another evil monster that needed to be slain. His thoughts were therefore not known to us with another reason for this being that the story was from the perspective of Beowulf, not Grendel.
In Grendel however, this changes as the story is from the perspective of Grendel and we are able to understand his thoughts and motivations which make him a far more dynamic character than in Beowulf.