Finally enabled scholars to unlock the Egyptian past.
Explanation:
<em>The Riddle of the Rosetta Stone</em> by James Giblin provided an informative text on the Rosetta Stone that was discovered by researchers. This stone led to an insight into the language and history of the erstwhile unknown Egyptian life.
In the given passage from the text, the author mentioned how this discovery <em>"finally enabled scholars to unlock the Egyptian past"</em> which has been unavailable till now. It possesses the key to the life and language of the Egyptians, providing access to learn more about them.
Thus, the phrase that supports the view that the people who deciphered the hieroglyphs played an important role was "finally enabled scholars to unlock the Egyptian past".
