The detail you provided contributes to the development of the theme primarily through option A: The description of dawn represents a new beginning for George.
In literature, dawn is often symbolic of renewal, hope, and new opportunities. By highlighting the colors of the dawn and the transition from night to day, the imagery suggests that George may be on the brink of a transformative experience or a fresh start in his life. While the other options may also have some validity, the symbolism associated with dawn most directly aligns with the idea of new beginnings, which is a common theme in many narratives.