If the story were told from the Moon's perspective, A would be the most relevant option:
A. The audience would know what powers the Moon has over the Earth.
This perspective would allow readers to understand the Moon's thoughts and feelings about its own influence, rather than just presenting it as a subordinate to the Sun. The Moon would likely reflect on its role in affecting tides, its relationship with the Earth, and might express its hopes for recognition, thus changing the narrative focus.