Which excerpt from The Riddle of the Rosetta Stone shows a cause-and-effect relationship?

“The group traveled up the Nile in two boats, stopping along the way to copy inscriptions on temples and monuments.”

“A few experts challenged Champollion's methods and clung to the notion that the hieroglyphs had a purely symbolic meaning.”

“Scribes generally used the hieratic form when they were writing on papyrus, and hieroglyphs when they were carving inscriptions in plaster or limestone.”

“Once they had mastered the three kinds of Egyptian writing, nineteenth-century scholars had the key to more than three thousand years of Egyptian history.”

Hurry I have 10 mins and it 15 pts