Hades was the . a.God of War.

b.Goddess of Wisdom

c.God of the Underworld.

Hades was the god of the underworld

The last option, gertrude's description of ophelia's death is poetic, is most likely. there is no hint of the first two options, and the third is probably not on gertrude's mind because she describes her as going from positive ( melodious lay) to negative (muddy death).