One way to punctuate a compound sentence correctly is to join the two independent clauses with

the answer would be d. he tells the story through a teenage narrator.

the answer is emerged from.

orpheus descended to hades, the world of the death to rescue eurydice. no mortal had ever done this before him, he survived because he was protected by the gods. the word "underworld" gives us a clue, he emerged from it like a whale emerges form sea for exemple.