There was no significance of Rappe of Nanking. they just want to show what power they though they had.
One thing was that Seas were sometimes difficult to navigate which limited communication - D. this was already a factor which limited the possibility of one united Greece emergin because it made it very difficult to talk to these isolated islands that couldbe found through the difficult-to-navigate seas.
Another thing was that C - some city-states were located on isolated islands.
Marquis de Lafayette is best know for is aid to the Americans during the revolution were he fought along side them to help win the war
B......... there's not much information to go on