Which choice explains a characters functional significance?

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From his studies of coptic, champollion knew that the egyptian word for "sun" was pronounced rah. he wrote down the first two letters of that sound, ra. next he put a question mark for the unknown middle hieroglyph. then, at the end, he wrote ss, the sound of the last two hieroglyphs. he studied the combination: ra ? ss. suddenly he remembered a famous pharaoh whose name appeared in ancient greek chronicles and also in the biblical book of exodus: rameses, or ramesses. could this be a hieroglyphic representation of ramesses' name? based on the excerpt, what detail did champollion need to conclude that the hieroglyphics might represent ramesses’s name?

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