Constantinople helped the Byzantine Empire due to its central location in the world at the time. It had access via ports to the Black Sea and the Mediterranean Sea, allowing for extensive trade with the rest of Europe and Asia.
The Indian Ocean does not touch the continent of North America. The Southern Ocean (the fifth ocean), which is sometimes considered by many to be an extension of the Pacific, Atlantic and Indian oceans and surrounds Antarctica, also does not touch the continent of North America.
Answer:
B. Radiant energy is the answer.
