The soviet union was officially dissolved in a. 1991 b. 1989 c. 1990

1991

Explanation: It was dissolved after the failed attempt of communist hardliners to overthrow Gorbatchev from the leading position in the country. In 1991 (March) there was a referendum (three republics were against) where the people of USSR decided to make a new federation. In late 1991 there was a failed coup against Gorbatchev after which Gorbatchev resigned. After this resignation USSR was formally dissolved by the Supreme Soviet.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion