"Oranges" captures the innocence of young love. Soto captures this feeling by using a variety of imagery. He uses many examples of both visual and auditory imagery to describe each moment of the walk to his audience, reminding the reader that in addition to being innocent, young love is also not easily forgotten.
The correct answer should beThrough primrose-tufts, in that sweet bower,The periwinkle trail’d its wreathes;
Alliteration is when words in the same sentence begin with the same consonant and here we have "through, tufts, the, that, trail'd" as well as "primrose, periwinkle".