Answer:
The lines "I took the one less traveled by," shows that the speaker made an uncommon decision.
Step-by-step explanation:
The speaker of the poem "The Road Not Taken" recounts the time he had gone for a walk among the woods and his decision to take the road that seem to be less traveled by other people. This decision of his has made him realize that that single decision has changed him, and he also kept wondering the "what if' of the whole decision, "what if he had chosen the other path, would that have made anything different?". So, by choosing "the one less traveled by", that decision has made all the difference.