Answer:
C. They can both function as nouns.
Explanation:
I calculated it logically
Explanation:

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Styx, in Greek mythology, one of the rivers of the underworld. The word styx literally means “shuddering” and expresses loathing of death. In Homer's Iliad and Odyssey, the gods swear by the water of the Styx as their most binding oath. ... There is a legend that Alexander the Great was poisoned by Styx water.
D. he weeps because the songs express great pain