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Answered

Beowulf slays Grendel in order to —

Asave Hrothgar and the Danes from the monster
Bprevent Grendel from invading the land of the Geats
Ckeep Herot from being destroyed
Dcarry off the treasure in Grendel’s lair

Verified Answer :

He slays Grendel to save Hrothgar and the Danes.  Grendal is the antagonist in Hrothgar and Beowulf specifically goes there to help, because he is a hero.  Heroes in mythology have the primary goal of obtaining immortality through the one way a mortal can - being remembered for their deeds.

Answer:

A) save Hrothgar and the Danes from the monster