Based on details from The Riddle of the Rosetta Stone, what is an effect of the hieroglyphs and the Greek alphabet appearing together on the slab?

The slab carries the same message in hieroglyphs and Greek. Because scholars could read Greek but did not yet understand the hieroglyphs, they could compare the versions to work out what the hieroglyphic signs meant. This makes choice B, the opportunity to decipher the unknown hieroglyphs using the known Greek language, correct.

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