Read these lines from Robert Frost’s "The Road Not Taken.”

Two roads diverged in a yellow wood, and sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;

Then took the other, as just as fair

Which statement best describes these lines and why?

These lines are an example of a metaphor, because the entire poem is about two different wooded paths that exist in nature.
These lines are an example of a metaphor, because the author describes the trip he takes down the path he chooses.
These lines are an introduction to an extended metaphor, because they are introduced early in the poem and developed as the poem continues.
These lines are an example of an extended metaphor, because they are repeated at both the beginning and end of the poem.