Which sentence most clearly uses figurative language? The streamers were red gashes cut across the sky.

Hard to say, as you only gave one sentence, but the sentence you provided is  an okay example of figurative language.

the bottom of the ocean

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.