If someone were to describe "the rosetta stone” to a friend, he or she would most likely compare it to
a. a mystery novel.
b. a fantasy novel.
c. a romance novel.
d. an adventure novel.

The answer is: a. a mystery novel.

The Rosetta Stone is granodiorite stele found in 1799, this stone is written in two languages  Egyptian and Greek and three writing systems; hieroglyphic, demotic, and Greek, this stone has been the key to deciphering Egyptian hieroglyphs.