Answer:
The Rosetta Stone successfully provided scholars with the key to unlocking the meaning of Egyptian hieroglyphs.
Step-by-step explanation:
This sentence is the one that best resembles an adequate thesis for Linh's essay. The thesis is the main idea of an essay, or the main claim that an author wants to prove in the essay. Linh tells us about the Rosetta stone, how it was found, how the experts reacted, and how it allowed them to decipher Egyptian hieroglyphs due to the fact that it also showed Greek letters.