Answer :
Based on the sequence of events in The Riddle of the Rosetta Stone, I am pretty sure I can determine the first effect of Cairo falling to the Turkish army in the spring of 1801 which is being revealed by the option : The French scholars hand the Rosetta Stone to the Turks. This option is the only suitable among the others. Do hope you will find it helpful!
Regards.
Regards.
The answer is C. Both the French army and scholars retreat to Alexandria.