Which line most contributes to the tone of wistful reflection in the last stanza of Robert Frost’s "The Road Not Taken”?

“I shall be telling this with a sigh” most directly creates a wistful, reflective tone. The word “sigh” suggests the speaker will look back with emotion and perhaps some regret or longing. The other lines establish the time and the choice, but this line reveals the feeling behind the memory.

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