Which of the following bodies of water did the eastern roman empire border?

the black sea
the atlantic ocean
the caspian sea
the north sea

answer:

the black sea

explanation:

the black sea because the eastern side only shared that body of water by itself. the other bodies of water were not touching it, or at least from i saw from this picture of the map.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.