Final answer:
Without the context of Part A, it's difficult to determine the best answer. However, the sentence about the Rainbow Crow's transformation upon returning could support a theme of sacrifice or change.
Step-by-step explanation:
The student is asking for the sentence from "The Rainbow Crow" that best supports their previous answer (Part A), of which the content is not provided. Without the context of Part A, it is challenging to determine the best supporting sentence. However, based upon what is typically valued in a narrative, and understanding that the Rainbow Crow's journey may involve themes of sacrifice and perseverance, one might infer that the sentence "By the time he returned to deliver the precious torch, though, he no longer looked the same." could serve as a solid example of sacrifice or transformation, which are common themes in many stories.