Your question is incomplete because you have not provided the answer options, which are:
it was translated into English.
present-day experts came up with a new theory.
a Greek version was discovered.
an almost complete copy was discovered.
Answer:
an almost complete copy was discovered.
Explanation:
In the excerpt from "The Riddle of the Rosetta Stone", the author James Cross Giblin. makes reference to the copy of the text of the Rosetta Stone, which was found in 1887 in Egypt. Thus, the new discovery has allowed scientists to compare the text with Greek and vernacular versions. Besides, they hope to find more copies, which would allow them to translate some intangible passages.
I'm not sure if there were specific answer choices but using complex words actually makes your statement rather unclear, especially assuming they are words the average person wouldn't know or understand.
The closest meaning to the word congested as it’s used in this means when someone can’t breath because the this she nose becomes swollen that’s why is also called stuffy nose.