Which sentence from The Riddle of the Rosetta Stone includes an opinion?

The writings of Horapollo circulated widely throughout Europe and influenced the study of hieroglyphs for centuries to come.
By the time the visitors from Greece arrived, no living Egyptian knew how to read the hieroglyphic writing of his ancestors.
Looking at a certain group of symbols—which actually stood for the name of a pharaoh—Kircher let his imagination run wild.
At the top are fourteen lines of hieroglyphs—pictures of animals, birds, and geometric shapes.