Answer:
A. To decipher Egyptian hieroglyphics.
Explanation:
It was discovered in 1799 and held three versions of a decree issued at Memphis, Egypt. While the top and middle texts are written in Ancient Egyptian using hieroglyphic and demotic scripts. The last part is written in Ancient Greek, a language more known than the Egyptian. The Rosetta Stone became a key element to deciphering Egyptian hieroglyphics and therefore opened the window to ancient Egyptian history.
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