Read the details from The Riddle of the Rosetta Stone by James Cross Giblin.

Detail 1: Champollion deciphered the hieroglyphics on several cartouches that were discovered in ancient Egyptian tombs.

Detail 2: One cartouche that Champollion deciphered had the name of Alexander the Great.

Detail 3: Another cartouche that Champollion deciphered had the name of the famous pharaoh Ramesses.

Detail 4: Another cartouche that Champollion deciphered had the name of Kleopatra.

The details best support which big picture idea?

Cartouches from ancient Egyptian tombs commonly contained the name of a famous leader.
Ancient Egyptian tombs commonly contained the treasures of famous leaders.
Hieroglyphics are symbols as well as representations of sounds.
Deciphering hieroglyphic text took the work of several dedicated scholars.