We can see here that based on this excerpt, James Cross Giblin believes Akerblad was overly: A. Confident
Based on the excerpt from "The Riddle of the Rosetta Stone" by James Cross Giblin, the author implies that Akerblad's initial success in identifying demotic characters led him to a serious mistake, wherein he became convinced that the demotic script was entirely alphabetic. Consequently, Akerblad and other scholars made no further progress in deciphering the demotic passage on the Stone.
The keyword here is "became convinced," suggesting that Akerblad's belief in the demotic script being entirely alphabetic led to a halt in progress.
The complete question is:
Read the excerpt from The Riddle of the Rosetta Stone.
These were impressive achievements. But Akerblad's success in identifying so many demotic characters now ed him to make a serious mistake. He became convinced that the demotic script was entirely alphabetic. From then on Akerblad, and other scholars like him, made no further progress in deciphering the demotic passage on the Stone.
Based on this excerpt, James Cross Giblin believes Akerblad was overly
A. Confident
B. Determined
C. Ambitious
D. Enthusiastic