Which character is described in these lines?

"But on earliest occasion he quickly laid hold of. A soldier asleep"

Higelac

Beowulf

Grendel

Hrothgar

This quote refers to Grendel, the monster. The quote is talking about how the monster has killed and is eating one of the soldiers, so it can really only be about Grendel, given that he is the only man-eating monster among these options. Higelac was a king, as well as Hrothgar, and Beowulf is the protagonist of this epic poem.