The correct options are
A North Sea, Arabian Sea, Red Sea, Bering Sea.
B Black Sea, Caspian Sea, Aral Sea, Dead Sea.
Marginal seas are extension of oceans and partially surrounded by land. Some of the examples of marginal seas are North Sea, Arabian Sea, Red Sea and Bering Sea. Inland seas are completely surrounded by land and its examples are Black Sea, Caspian Sea, Aral Sea and Dead Sea.