Which type of sound device appears in the excerpt from “The Road Not Taken” by Robert Frost?

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;

A.
alliteration
B.
slant rhyme
C.
consonance
D.
end rhyme