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Answer: The speaker understands that taking one opportunity will likely prevent him from going back to take another.
Explanation:
In "The Road Not Taken", by Robert Frost, the author finds himself wondering whether to take one road or the other. In lines 13-15, he claims "knowing how way leads on to way, I doubted if I should ever come back", meaning that he understands that choosing one path will probably prevent him from going back to take the other one.
Option A is incorrect because the speaker does worry about not being able to return to take the other road. Option B is incorrect because the selection doesn´t refer to whether he took the less or more traveled road, and he actually ends up choosing the less traveled one, not the more traveled. And option D is incorrect because he understands that taking an opportunity requires relinquishing other possibilities.