Read the first stanza of Robert Frost’s "The Road Not Taken.”Two roads diverged in a yellow wood,And sorry I could not travel bothAnd be one traveler, long I stoodAnd looked down one as far as I couldTo where it bent in the undergrowth;

The speaker says he is “sorry” that he cannot travel both roads, showing regret about having to choose only one. Therefore, “regretful” is the best answer; he is not scornful or grateful.

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