The idea emphasized by the metaphor in line 22, "My eyes were lights left behind by the stars shooting by in the darkest night," is best represented by:
D. A promising turning point in the thoughts of the speaker.
This line suggests a shift from being lost and troubled in one’s thoughts to a realization and clarity, akin to finding light in darkness. The metaphor of stars shooting by evokes a sense of hope and inspiration, which indicates a positive change in the speaker's mindset.