Developed countries have very high GDPs per capita, while countries with developing economies have mid-range GDPs per capita. There is a broad middle range between the world’s developed countries at one end and the world’s least-developed countries at the other end. The dominant sector in developed economies is the tertiary sector. The dominant sectors in developing economies are the primary and secondary sectors. Most people enjoy a high standard of living in developed countries. Developing countries are moving toward greater prosperity; the standard of living is improving for many people, but large numbers are still living in poverty.
They generate less GDP/capita revenue than developed ones in developing countries. Developed countries have larger industries with efficient services, while developing countries do not have the same diversity of sectors in the economy. In developed countries, life expectancy is higher than in developing countries and living standards are high in developed countries.
Hot water rises, cold water sinks. So we've ruled out A and B with that. And I believe the currents flow from Atlantic to Pacific, making the answer D.
The Gulf of Mexico is a lot further South than Canada - it's East of Mexico and South of the United States. The other bodies of water do border Canada and Beaufort Sea is actually a part of the Arctic Ocean.