The the repetition of happy should mean that the poet is making the tone a happy mood and that he is trying to show that the poem is a happy them
Tbh i would say B because i saw that question alot and B is the only correct answer
1. "Get thee back into the tempest and the Night's Plutonian shore!" (Plutonian alludes to the Roman god of the underworld)
2. "On the pallid bust of Pallas just above my chamber door." (Pallas alludes to a Greek titan god)