Final answer:
Robert Frost's 'The Road Not Taken' centers on the theme of choices in life, highlighted by the diverging paths in the yellow wood and culminating in the significance of taking the less traveled road.
Step-by-step explanation:
The detail in the poem The Road Not Taken by Robert Frost that best develops the theme that life presents many choices is the line, "Two roads diverged in a yellow wood," showing the literal split in the path which represents a choice or decision. Further into the poem, the speaker's decision to take "the one less traveled by" emphasizes the theme of making personal choices that define our lives. Finally, the last lines, "I took the one less traveled by, And that has made all the difference," ties back to the overall message that the choices we make, whether they align with others or diverge, are significant in shaping our journey through life.