Can you please provide background information to your story? There can be no information created with the paragraph listed. Please let me know when you’ve done that and I’ll be happy to help!
The correct answer is tone. Imagery is using vivid description while style is the personal type of narration like what words they use or grammatical constructions. Theme is the underlying idea while the voice is seen through the tone, whether it's dark and broody or joyful or anything similar.
I think it’s both, but probably leaning more towards ethos.
Answer:
Robin wanted to join the “gods” and live in the simulated world she helped create; ironically, the speaker, who is one of them, envies her mortality and laments the “sub- life” of the simulation.