Which line from the text is the best example of the use of imagery by the author?

At the opening of our story, Mother Ceres is busy tending to the harvest of wheat, corn, rye, and barley.
After visiting with the sea nymphs, Proserpina does exactly what her mother feared—she wanders into the forest.
Wait … and I will give you a garden full of prettier flowers than those, all made of pearls, and diamonds, and rubies.
Next they crossed over the River Lethe, a magical stream that makes people forget every care and sorrow.